Hacked site

Your site can be hacked. Check if you have this pages in real. Check if you have this folder on your hosting. Check if .htaccess does not have weird redirects

Carefully follow this guide. When you’re done, you may want to implement some (if not all) of the recommended security measures and start backing up your site.

This is not part of your content? If not, you should consider scanning your website using WordFence would be useful here. You can also explore manually with an FTP.

Good Luck.