Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d7f91e8990e094…

MALICIOUS

PDF

43.7 KB Created: 2021-10-01 12:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b174876882f58fbadde4e65e4ec74188 SHA-1: 81129a8f060240398859d7ea830513ca74fd9676 SHA-256: 25d7f91e8990e0940f5ff359c9b074f163f55fe8ef74d6600e1e56843981755c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains. These links appear to be part of a link farm designed to redirect users to download files, likely as part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7476

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=pc+mission+games+free+download+full+version+for+windows+7 PDF link annotation
    • https://subarini.ro/mm/file/fupasalefudidimepuxupuja.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/muvazutefafukogagome.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161340b58e79a7---92258380072.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/wajididinexuxosuwawiduke.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d709939d54c74fc43b6b7d9dcf57df3a/59168228645.pdfIn PDF document text
    • https://sergiomauri.com/images/file/60900106136.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/78633581130.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/bonefejogogukoluxe.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/kumelagiverutomuge.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/tonibovinupiwo.pdfIn PDF document text
    • https://goodline.by/userfiles/file/livabazevi.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/7861398752.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/60494607398.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/90013958236.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/zituzuke.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/pujabuvux.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ffc9aee9---18114467348.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/dilelipib.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210916_4349CB18386E67E8.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27813019663.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/62503497919.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16155d84a987d8---raxagotilibuvum.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/81795030160.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/moketor.pdfIn PDF document text

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