worid-of-books.com is a fake book download site punting malicious executables. The strange name can be explained if you substitute the lowercase "i" with an uppercase one, giving worId-of-books.com which is presumably meant to fool people.
The site looks reasonably credible and appears to have about a million downloadable books, but they are not all that they seem to be. If you try to download a book, you get an EXE file instead of a PDF. What's in the EXE file? Well, malware of course! Detection is fairly patchy according to VirusTotal, but this appears to be a Cycbot variant.
Download it a second time and you actually do get a PDF file.. well, an 8 byte file that just says "PDF file" and nothing else. Subsequent attempts seem to fail with an error message of "We are sorry, this book is now being checked. Try to download it later!". It's pretty clear that worid-of-books.com is tracking visitors (perhaps by IP address) to stop them being able to repeat the infection.
The site is hosted on 126.96.36.199 which is Asociatia Family Network Connections / FAMILY-NETWORK in Romania, along with a whole load of other sites. It's worth blocking everything in this IP range.
The ThreatExpert report is here, it might help you clean up your machine if infected.