404 Not Found with function.file-put-contents

Randomly a few days ago Google went from finding almost no URL 404 errors on my site to suddenly finding about 2K pages that give a 404 error.

In all cases, it’s simply because the url has this at the end: http://www.correct_url/function.file-put-contents

I didn’t update any plugins or wordpress to make this happen, just randomly did.

I also can’t find where google is seeing these links. Navigating around my site is fine, and traffic is completely normal (high trafficked site, so I get a good sample-size very fast). And no evidence of anyone clicking on these links when looking at the data in Google Analytics. Seems like only Google knows about them.

I then checked my sitemap, and no such links found there.

I did have the /home partition on my server fill up around the same time due to a bug in the Quick-Cache plugin, which has since been fixed (and I manually deleted the cache to free back up the space). However, the day it found about 2/3rds of these 404 errors, I actually had quick-cache disabled all day while I investigated the issue and was in the process of deleting the cache folder for Quick-cache.

Could that have somehow caused this?

Also, where is Google likely seeing these links with function.file-put-contents on the end?