Two weird files found

Going through my server files, checking what should and should not be there.

Found two html files. Code similar to this in both

PHP Code:

Phrase: "# when back again awoke it came the sounds i and rainedslowly"
File: "ydnGKPFcq.html"
Url to Check: "http://www.thespainforum.com/ydnGKPFcq.html" 


And

PHP Code:

Phrase: "# when back again awoke it came the sounds i and rainedslowly"
File: "ydnGKPFcq.html"
Url to Check: "http://www.thespainforum.com/ydnGKPFcq.html" 


Anyone got any ideas about what they were / are / might have been

They have been on the server for over a year

No idea... i would delete them

I cant find any mention of the phrase anywhere on the net other than the words of a song

Posted the same code

The other one was just as weird

PHP Code:

Phrase: "# spirits but of troop blest a"
File: "ydnA6MIKw.html"
Url to Check: "http://www.thespainforum.com/ydnA6MIKw.html"