Can this tcpdump file be converted to pcap?

Yes, you can use text2pcap to convert it to a pcap file, but you will first need to massage the data into a format that text2pcap accepts, because the depicted format is currently not supported by text2pcap.

So first, you can convert the data into a suitable format by using Kurt Knochner's perl script, given as an answer to this question and copied here for convenience:

#!/usr/bin/perl
$| = 1;
my $regexp_time = '(\d\d:\d\d:\d\d.\d+ )';
my $regexp_hex = '(0x\d+:\s+)([0-9a-f ]+)+  ';
while (<STDIN>) {
my $input = $_;
if ($input =~ /^$regexp_time/) {
print "$1\n";
}
if ($input =~ /$regexp_hex/) {
my $counter = $1;
my $line = $2;
  $line =~ s/ //g;
  $counter =~ s/(0x|:)//g;

  print $counter . join(&#39; &#39;, ( $line =~ m/../g )) . &quot;\n&quot;;

}
}

Assuming the output of tcpdump is saved in a file called, tcpdump.txt, and Kurt’s perl script is saved as convert.pl, run:

cat tcpdump.txt | convert.pl > tcpdump_converted.txt

Once that’s done, run text2pcap on the converted file:

 text2pcap -l 101 tcpdump_converted.txt tcpdump_converted.pcap

Note that here I’m specifying “Raw IP” encapsulation. See http://www.tcpdump.org/linktypes.html for link types.