Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a6de2248d84781…

MALICIOUS

PDF

44.8 KB Created: 2021-09-17 23:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc9a5f3d454c05f5bcbf13e3f58038c1 SHA-1: ca776aefcf745d2939b2df5ff24e9f107ff522fc SHA-256: 44a6de2248d84781e214cb7aa78940229e692635c56b4cfbd59d65fd9a65044d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external PDF files hosted on potentially compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7749

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://mongolia-volkslift.com/uploads/files/49679478089.pdf In PDF document text
    • http://gro-felix.si/uploads/ramevilixajajimari.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/62201570693.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qajkca546n10mgu9ir3d2gks92/rogubivulunasala.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161422828af414---vezotezurikunez.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/metusupeligedij.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16139c522374b0---zopetiwiwigeretineranekaf.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/mijodobel.pdfIn PDF document text
    • http://splogservice.ru/content/files/kaxaj.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/vuxudujosivowufibinonalit.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fajirawovirufi.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/42945455692.pdfIn PDF document text
    • https://nyig.com/files/file/80951487075.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/37651884435.pdfIn PDF document text
    • https://razredna-nastava.net/files/81981589401.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/59799572484.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/somuwo.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/67942096949.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/votivirufola.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/fubobedupobokulu.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/12564824460.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/39m09q2tose7l3i2q2bh43clcc/fugologukebep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=among+us+io+gamePDF link annotation

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