Are you running WordPress? At some point was it hacked? Is it hacked now? If it was at some point, maybe those were all real pages in the past. If it is now, ma

Are you running WordPress? At some point was it hacked? Is it hacked now? If it was at some point, maybe those were all real pages in the past. If it is now, maybe the bad guys just changed what they were doing. I've seen pages like this generated in hacked WordPress sites.