Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1a7491e3476ccf…

MALICIOUS

PDF

54.7 KB Created: 2021-06-28 09:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 427561c2e3c0cf05bf4f5ce4290fcfb9 SHA-1: 4cb489ee39161e1ae214030ff725c63ab115ce40 SHA-256: cb1a7491e3476ccf6f429a3011a3bbd5492952496cad0d1c7299a097f0ad8916
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The PDF structure and the presence of many external links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6355

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d76d8a536---4664967772.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mgiqs58vaap360lumku3l2p7tq/32350826081.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bmju47eb06b5974isseaitcal2/xinifejimafufajogoj.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d086aa7d4929a16a2813a8df8f613fba/73326357124.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1lt1k5aerd688ia3hvj26hr4a3/niruvofagu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3d46e0feaa3dd604b0315d248a0e63cd/94886165575.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/80872011101.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/fomolobajuvemixozij.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/jomevilazowunaw.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffb94c4149---galepixezaj.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a409b04ec3---6664323463.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/ribekilaxipojomubepomu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1eb0b1e72---18258710592.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/nuwebovo.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/zutejekemek.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/77189291370.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23d0ed57f---mugelo.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/87681882408.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/nigoli.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6359e89dd3---99240439875.pdfIn PDF document text
    • https://dm288.rs/slicice/file/lepis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=introduction+to+supramolecular+chemistryPDF link annotation

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