Try it this way:

#!/usr/bin/perl -w

use warnings;
use strict;

use threads;
use threads::shared;

my @Array : shared = ();

my $thr = threads->create( \&handle_array , \@Array );

while( 1 ) {
        do_something(\@Array);
        printf "Main: Number of files: ". scalar(@Array) . "\n";
        sleep 5;
}

sub do_something {
    my ( $Array_ref ) = shift;
    my %hash : shared = ( 
        file => 'test1.zip',  
        price  => '10.00',  
        desc  => 'the 1st test' 
    );

    push @{ $Array_ref } , \%hash;
}

sub handle_array {
    my ( $Array_ref ) = shift;

    while (1) {
        printf STDOUT "Thread: Number of elements before: %d\n",
            scalar @{ $Array_ref };

        my %hash :shared = (
            file => 'test1.zip',
            price  => '10.00',
            desc  => 'the 1st test'
        );
        push( @{$Array_ref} , \%hash );
        printf STDOUT "Thread: Number of elements after: %d\n",
            scalar @{ $Array_ref };

        sleep 10;
    }
}
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The main point is that any structures (references) you push into a shared array, have also to be shared themselves.