How to transfer pdf to iPhone without iTunes

1. Download ifunbox.

2. Use the Copy from PC button to browse for the pdfs and copy to the iphone's ibooks directory under 'private/var/mobile/media/books'.

3. Open iFiles (purchase from Cydia) and navigate to the abovementioned directory. iFiles will give you the option to open the pdf using iBooks. From thereon, the pdf will always be displayed on the iBooks bookshelf. No need to go through iTunes.