PDF malware analysis — malicious · 3c466136f8c13d72

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 09:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: c394d930fae949c4f308662ad1c82e89 SHA-1: 7e98d51ff487be8192911f4283bce31a02253f02 SHA-256: 3c466136f8c13d722b5adcaeb7c286f0aac3089825609f9afa8eff0eec461b79

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of these links.

Machine Learning

Nyx PDF Classifier malicious score 0.6930

Heuristics 5

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 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 https://crewmak.ru/uplcv?utm_term=watch+patriots+day+online+free PDF link annotation
- https://bbpartner.cz/userfiles/file/bimesaj.pdfIn PDF document text
- https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/tekofazovon.pdfIn PDF document text
- http://solmoda.it/userfiles/files/raxujovodijenovevutekegu.pdfIn PDF document text
- https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/kunudomoju.pdfIn PDF document text
- http://vhshf.de/File/petuxadazi.pdfIn PDF document text
- http://vantaidongsaigon.com/uploads/files/kukumezuluro.pdfIn PDF document text
- https://sogelec-eng.com/files/ckfinder/files/gonuge.pdfIn PDF document text
- http://vanguardhungary.hu/userfiles/file/43654827.pdfIn PDF document text
- https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a4ea6c325f8812a0950d4bf963c7ccdf/75743616662.pdfIn PDF document text
- http://tramtronbetong.com/uploads/userfiles/file/94084127198.pdfIn PDF document text
- http://yepuco.com/uploads/files/77654551498.pdfIn PDF document text
- http://njxinbell.com/upload/files/fevixutudovofep.pdfIn PDF document text
- http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/pivisunupimawafafo.pdfIn PDF document text
- https://phr4u.com/files/19655047731.pdfIn PDF document text
- https://tennis94.fr/img/pics/files/76080811525.pdfIn PDF document text
- http://solarexperte.ch/fckeditor/editor/images/file/jewaj.pdfIn PDF document text
- http://sjanzee.nl/file/63703555124.pdfIn PDF document text
- https://fgcrubochi.com.ng/ckfinder/userfiles/files/zaguloni.pdfIn PDF document text
- https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/70c4f6acc93d8381d0045669ba755ad7/wibagofojijujuroxa.pdfIn PDF document text
- https://stl-log.com/htdocs/cljr/data/files/34738389585.pdfIn PDF document text
- http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161333ae83a41a---367103278.pdfIn PDF document text
- http://chuabenhxuongkhop24h.com/images/files/38253322393.pdfIn PDF document text
- https://bbox.ru/images/shared/file/zodipofipetodorawo.pdfIn PDF document text
- https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/04c39f3a61db9e41c790a2706209963e/jobatopotizi.pdfIn PDF document text
- http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/gefujile.pdfIn PDF document text
- 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_off0000cc21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC21	10824 bytes
SHA-256: `ab284876edc265204196fb4c5d3feda4fcf1532d9795732fb35e594aa66129db`
`font_01_sfnt_off0000e51f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE51F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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