Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b860d93cc0e5b8e…

MALICIOUS

PDF

48.4 KB Created: 2021-09-12 00:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6532f7be2dcb93c03e5e070bdebbc996 SHA-1: cf0d2ab4762544ccb3f61326864e78097efd0fda SHA-256: 4b860d93cc0e5b8efd6896da244e155295baa272be67fcc079b45e6a8bbfabad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9210

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 http://thienlongadv.com/upload/files/zigebedoxigajofi.pdf In PDF document text
    • http://evo-models.com/uploads/userfiles/files/67373379315.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/fedisatel.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d2b38221---fujimapenutubolugubu.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/56666810345.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/boboreziwosimofazegaxeze.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135460f833c4---98551691139.pdfIn PDF document text
    • http://skupka54.ru/upload/m/81889908267.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/fidulalugigin.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/27632888990.pdfIn PDF document text
    • http://sooclose.eu/upload/File/vupexa.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/depuwewajejetidenuf.pdfIn PDF document text
    • http://belv.ru/userfiles/file/36201683924.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210909075243.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e756b2cc8---74167000111.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/zejisurewuwedixebovexaf.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109070737434631.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/gosuronotijur.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/pizipumop.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/20344113413.pdfIn PDF document text
    • https://olterus.com/contents/files/81976390938.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/zadosiximag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+lost+sisters+read+onlinePDF link annotation

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