Hi Peter,
I sympathize with your situation. Since the home page is blank with just a login feature you have no information about the site or its purpose. A Google search for the site shows nothing but the home page. A WHOIS search shows the site owner is private.
There is no way to know the reason behind the traffic. Someone could have shared a "free stuff" post and for whatever reason provided a link to your site. When users arrive at your site they are of course disappointed then leave.
Some options:
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contact the site owner via the WHOIS e-mail. Ask the site owner to remove the link.
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block all traffic from Bangladesh. This option will work if all or most of the traffic is from that site.
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block all traffic which shows that site as a referrer. I have never implemented such a solution but your web host can likely offer options in this regard. You may have to implement a firewall.
Best wishes