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Samething happened to me a last month due to a securrity break in a pluggin that was part of my wordpress theme.

After hacked the site with injected url and also altering htaccess file (check that out) they changed the htacces file in order that if you enter your url you could see the correct version of your web, but if you enter your website in a google search traffic wen to this spammy viagra stuff pages.

I also recieved a manual action on my site.

What i did:

1- removed the injected files that were creating the spammy urls

2- edited the htacces file locating what code they had changed

3- summited a reconsideration request explaining what it was happening

4- Removed on webmaster tools al url that were spammy created on my site to remove them from google index

After 10 days manual action was removed. But till know i still have spammy links to 404 on my site. This happens because they also hacked other sites and creates like spammy linking networks. Has people start recovering their sites the amount of links to this pages will reduce.

My experience this big amount on 404 it has affected on about 30% of traffic. This traffic has know recovered almost completly and the amount on 404 is reducing with time.

So my conclusion is that this 404 are not healthy but they will be gone with time and your site will recover.

I have had a big attack to my wordpress site and the only pluggin that was hable to stop it was OSE Firewall

About seo plugin i have yoast premium that is payed, but free version is enought

It would be nice to have one app on iPhone. I use most of my time on moz community in the iPhone

I think that if you write a big web with lots of pages and links in them, you also increase authority, but i am not sure. I think mainly and unfortunately is by link building

Thanks for the question Dan Lawrence and for the answers Keri Morgret. My web domain authority dropped beyond normal 5 points, i did not done any links or lost any so it was very strange.

I have detected on linkdetox site that had stolen a face photo of a smile from a star my website and is linking to the page.

I uploade a disavow with that site very bad domain. But my question is if should a take that picture of my site or rename so the link goes to 404.

It is not an important or relevant page for my website

I think that is not good for seo as it can over optimize word Flatiron Loft for Rent. If you have problems of time to alt all fotos it correspondent description i you will give the same name to all of them i would just label one with keyword and the other a would just use a name that you dont want to get the risk of being penalized for.

Same happens to me with smartphones i have a lots of 500 errors on smartphones that doenst appear on web, and i see good connection. I am starting getting doughts that smartphones on webmaster works correctly.