If your a PMwiki user make sure your installation is up to date, or remove it if your not using it. Someone is running a script looking for over 500 different kinds of pmwiki installations on 4 of my 6 websites. They are searching for beta software, and any 2.0 through 2.2 pmwiki installations. It’s really noticeable because the script tries SO many different combinations that it makes you access log light up if your looking at it.
Are you being hit from the same IP blocks ?