Where do I get calls on some product pages from, with tags like [MallKind], [MallID] or [Purl]

Aloha!

Maybe it's a too easy question, to ask for, and that's why i can't find an answer via google, but I hope you can help me anyway.

In error logs I often find failed calls on pages like

http://ift.tt/2ot1Tq8]"countryCode[/MallKind][MallID]"shopName"[/MallID][Purl]"productDetailPageUrl"[/Purl][Date]....

I don't use these tags in my code..

Is it any kind of search engine or a mislinked price comparison websites?

Many thanks for your help!