Recently, in the last two weeks, I started seeing a lot of odd 404 errors in GSC for my site. Upon investigation, the URLs are for fairly new articles, and the URLs are chopped in various places. From missing a character at the end to missing about 10 characters at the end of the URL. (an old similar issue is that GSC reports duplicate contents on weird subdomains that we've never used like 'smtp' 'ww1' or even random ones like 'bobo'.)
GSC doesn't report any 'linked from' for those odd URLs and I know for sure these links aren't on the site itself. They're definitely not errors in the CMS.
The site is a long established site (started 1997-1998) and we've been subject to a lot of negative SEO. I recently had to disavow about 1000 .ru domain linking to us, with some domains containing over a million link each.
Could these chopped links be a new tactic of negative SEO? How do I find these seemingly intentionally broken links to us?
