PDF malware analysis — malicious · a3e36d363921567b

MALICIOUS

PDF

62.3 KB Created: 2021-09-04 19:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b8c2276406143022d87107aa746996e0 SHA-1: 7d7580a397471a2633542272db8b0da3061ecaec SHA-256: a3e36d363921567baa59223d727ff3179f2e388113a3ccb7f76788385b28df81

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' and ML classifier further support its malicious nature. No scripts were extracted, but the presence of numerous suspicious URLs suggests the primary attack vector is directing users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.5578

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/l739rhlrem83nkc7k9d09rh9a0/74772617910.pdf In PDF document text
- http://dissanna.com/temp/fckeditor/file/bexukovipajezuwag.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba127a7f689---65362317300.pdfIn PDF document text
- https://kenadong.com/contents//files/84558610211.pdfIn PDF document text
- https://vegan-eshop.cz/data/file/59358282179.pdfIn PDF document text
- http://kustari.net/userfiles/file/derebiropi.pdfIn PDF document text
- http://umiyawoodworks.com/fckdb/userfiles/file/relexajitopo.pdfIn PDF document text
- http://nwatchonline.net/userfiles/file/40972145503.pdfIn PDF document text
- https://www.verimevzabavu.cz/ckfinder/userfiles/files/318991909.pdfIn PDF document text
- http://trungtinjsc.vn/upload/FCK/file/godaxiva.pdfIn PDF document text
- https://aldwalia.com/userfiles/files/vitowuretebimifokozerula.pdfIn PDF document text
- https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b19539eef30---37493494089.pdfIn PDF document text
- https://ludifrance.fr/userfiles/file/52317553903.pdfIn PDF document text
- http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/27627414628.pdfIn PDF document text
- https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/36k5iplcr0pjlosj95b913pmmm/16982957269.pdfIn PDF document text
- http://domholidays.com/userfiles/file/bozaliwifete.pdfIn PDF document text
- https://hopadive.cz/ckfinder/userfiles/files/41899524911.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073eaf4af591---56116724633.pdfIn PDF document text
- https://bestrecycledautoparts.net/images_i/file/2976845200.pdfIn PDF document text
- https://chv.vn/userfiles/file/48201884321.pdfIn PDF document text
- https://projectmine.hu/ckfinder/userfiles/files/31469878709.pdfIn PDF document text
- https://pharmnet.cz/ckfiles/files/files/vejosujalafasenukutolukuf.pdfIn PDF document text
- https://kaptenhoki.com/contents//files/79431414852.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-5-6/20210506234815195408.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=propeller+shaft+parts+pdfPDF link annotation
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c17d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC17D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d994.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD994	10400 bytes
SHA-256: `2a34ae7f7d8a75ffa65c3f69a20808a1944391cd527665400ee6c23f5f323aee`

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