Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5d5548137557b0…

MALICIOUS

PDF

88.7 KB Created: 2021-09-22 20:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5b0f894d83b2b2a875851240a9069495 SHA-1: 6da2c637a6082d57cde043969205152e15d68206 SHA-256: 2b5d5548137557b0962a4b607cceab14977c87306492d513926c43224b15eb19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external websites, many of which host other PDF files. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score support the malicious nature of this file. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8488

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dermatologomiguelgallego.com/miguel/fck/file/70595275209.pdf In PDF document text
    • http://home-plast.ru/foto/files/gikedizasonuk.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/tunudinoravedenasosavotef.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613552bec38e7---dubivala.pdfIn PDF document text
    • http://henca.com/files/details/file/nonenogapafoxawag.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///pasilaz.pdfIn PDF document text
    • https://deverfgrossiercms.deindrukdemo.nl/upload/files/86916220035.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/tufoxufi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/902db94c56e9a4a41cf868c8a51ec275/5962765565.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/joremitiz.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3a6701da---26142093598.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/likaborivofusekeroleleso.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/89162266.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/86164214480.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/37550959020.pdfIn PDF document text
    • http://adveotec.com/img/file/roredupozar.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/dobok.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/kezadoti.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/xowizokijelen.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/68057200357.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/76964442082.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/kafarijukofifezetid.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/7dcpkt3l0e56uc3sjl1f37lbcf/7090058631.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/67731208161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+the+orientation+of+a+pdfPDF link annotation

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