Since version 1.17.2 you can show a add to cart link directly in our WooCommerce PDF Catalog plugin. When you do not want to show this as a link, past the CSS code below into advanced settings > custom CSS:
.product-add-to-cart-container { background: #000; color: #fff; padding: 5px; width: 100px; margin: 10px auto; } .product-add-to-cart { color: #fff; text-decoration: none; }