The width and height of your iframe are set to 100% which is inheriting it’s values from the width and height of the article tag with id=“post-1037” which is being set by your CMS or theme.
This is why it’s clipping. Instead of using an iframe what about placing the div inside your post
EDIT* don’t forget to change the src attribute to an absolute URL
Also I believe there are some posts here on putting Hype documents in Wordpress that may be worth searching.