Security Error: PDF files must be hosted on the same domain as this site.

PDF is hosted on: http://https%3A%2F%2F1893.bg%2Fwp-content%2Fuploads%2F2020%2F12%2F%D0%A0%D0%B0%D0%B4%D0%BE%D1%81%D0%BB%D0%B0%D0%B2-%D0%A1%D0%BC%D0%B0%D0%B8%D0%BB%D0%BE%D0%B2.pdf but this site is: https://1893.bg