PDF form with buttons opens up URL with security warning window

I have a short-lived process that renders PDF form with data merged. The data is in XML format. 

The form buttons are assigned URL values when the form is opened. When I click on them,I get a Security warning prompting me to allow/block that site. When I click on 'Allow', I get a window of download statistics of the website that in the URL.

This would be annoying to the end user. How I do I suppress the Security warning window as well as the download statistics window before the PDF is opened ? Can this be done either at the process design, form design stage or using Java APIs ?

Thanks,

Jyothi