Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c296d44ad55c7f9…

MALICIOUS

PDF

143.9 KB Created: 2021-07-13 19:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6ee0c401c00c8d8a535a5f13782d0cb9 SHA-1: c51e029235ae0bc07d177ac44a64a52803180978 SHA-256: 4c296d44ad55c7f9c0d333f28e4eacf1574c81e01d591758ffe4b6b3911a4041
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of directing users to external, potentially malicious, websites. The authoring application 'wkhtmltopdf' is noted, but no specific script content was extracted to detail further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6156

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://ketchas.ru/uplcv?utm_term=cargo+securing+manual+requirements PDF link annotation
    • http://aarogyamedico.com/userfiles/file/60449958197.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/d295cc385fcd2aec22ac47a4c3f677ea/gawebugo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/roditolujaxub.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/27460949377.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2sn7avpbt71js7ahsn2ks56vhu/67666111016.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/josodokozagowalavin.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/91810099543.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/lijutukuzitigovobubim.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/44268202996.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a95902c0ecf---84535230409.pdfIn PDF document text
    • https://tantecoccole016.it/file/pabeligig.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/518222674.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/d77cd0ad07ce92ba6a4e42e2f3ea0a80/mikelemagitezomupu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b17513a84704e1f3567ee7122481fc1e/buvawotemoput.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/297e3801a7d93897a7178c8be659ddcc/13513200192.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3cc596bcde3f469d249b257eaaf1384d/visibunapozize.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ffb9f5b263b0122675d354af69a35fd7/30964206969.pdfIn PDF document text
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/govusiborunatasogaxu.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/47798885638.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/134ddcb723d586e5d842700867b552f9/48621809560.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082eff16d9a2---vorowik.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/42929562431.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mts6r826qha4lnhi2sh1eomtru/78214853401.pdfIn PDF document text
    • https://digireg.cn/upload/66612191837.pdfIn PDF document text

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