You just have to use the Wifi sharing feature as describe in this previous post.
1. Instead of accessing the web address on your computer, open it in Safari on your iPad.
2. From there, click on a PDF document and voilà, you can read the document on your iPad.
But there is more! By taping open in iBooks, you save this precious document in your iBook library and make sure you can read it later.
The document is then permanently saved in your iBooks library:
And you can read it on a large screen!
Genius Scan is available on the App Store.