It is possible to construct some automated system for spam removal but I think site admin will not bother with such a super-advanced technology

the way simpler solution is just to give moderator powers to more users and this will take care of spam.
Or maybe even give the right to everyone to delete any thread 1 day after it was posted if it has no replies from other IP addresses somewhat similar to >>10189 idea.

hiding and restoring posts is pretty pointless idea because poster can just repost it instead of waiting few days until moderators will decide to check it.

Also if someone is willing to fight this spam seriously I would recommend reporting those files to the file hosts where they are uploaded. what will invalidate everything so that spammer will get more harm from his spam here than benefit.