Unfortunately I think your site has been hacked.
Take a look at your sitemap.xml
The sitemap is massive and contains links to dodgy web sites that are not on your domain.
There is a discussion about the issue of hacked Evo websites:
I can't seem to find it at the moment but I think there was an additional 1.0.15 security patch released.
All versions can be seen here. https://github.com/modxcms/evolution/releases
If you have a backup of the site before the hack I would restore that.
If you don't have a backup from before the hack you may have to rebuild the site into a clean installation and new database.
Hopefully others on the Forums will have some thoughts on a solution to the problem.