If you use Google Drive, you can share content and embed this into your site.
Just add a simple textfield and fill in with the ID of the document.
Set the display on Google drive viewer format.
From now on the document (Word, Excel, PPT, PDF,..) is available for people with the rights to view the files.
It can be opened in the Drive.
If the file is shared global, everyone is able to see the content. Do the global settings in the Drive and use the ID. You don't need the link.