I want to send PDF file and Image to whatsApp. below method is for text. I want to send ABC.pdf instead of urlendcodedtext

<a href="whatsapp://send?text=urlencodedtext">Share this</a>

I want this

<a href="whatsapp://send?text=ABC.pdf">Share this</a>
or 
<a href="whatsapp://send?text=image.png">Share this</a>