Unclear URLs in Yandex.Webmaster?

Question

CMS

Hello. I recently added my site to Yandex.Webmaster, and today I noticed a very strange thing when scanning: the robot crawled more than 1800 pages! It is not clear where such a number came from, but it is so (there are no more than 100 of them on my site). I assume that these are the pages of the previous owner of the domain (because the URL for the articles is not mine either). How to indicate to the robot that I am the new owner of the domain?

Answer 1

Hacked and made a proxy.

Answer 2

Check external links in webmaster and ahrefsom. Perhaps the search engine found these pages through links.