Malicious PDF — malware analysis report

Static analysis result for SHA-256 282622848a3d0c22…

MALICIOUS

PDF

49.6 KB Created: 2021-06-29 21:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 910db4f6209f6ee3b951a25f9dd45b69 SHA-1: b4bdfb9342aea715bb8d2a6942eb43236690144e SHA-256: 282622848a3d0c2212c577277e3d2be6fb0c0a10cfb47339917b16655361add1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8987

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://catamma.ru/uplcv?utm_term=late+fall+allergies PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a832752161---51698450734.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe97da2cc2---8676692065.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/5295849060.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c428945c27---lewijamexepovapiz.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0dffa8dc2---ririlibabumituwona.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b0a3ef4e471fede58dc98561046edb88/kuvuzoviv.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/kowotapasidenatikobem.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e9014872afd2b071023f7a4958e732ca/95068246777.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B21B5B53349.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8e42e9ee5c7b8b600738c5edd7db2e78/dadogujam.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/letumagobajorupak.pdfIn PDF document text
    • http://dnepropress.net/files/file/ruseduwipel.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f72903ab0---30804843298.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e01aaebac---59109160241.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/07c9069ef15eade48e54275858f3e7f3/topunabotivajubi.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/79699991035.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jjoq6qqed2rvr7phfh1cvfobd4/61603793318.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/budatobilanolazotebuti.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///ropubarekupamitulefas.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fidulorisakizasemirawex.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/45459156172.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/31620132890.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ccc9c380405ebffed4d7754889dcf5be/mebitilapapapovinananemaz.pdfIn PDF document text

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