Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ff3b878f2ed55b…

MALICIOUS

PDF

73.4 KB Created: 2021-07-27 03:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 400d7e647789d403312532a1d348f0b7 SHA-1: b1889a6e675ec53caf4117d259e9e92421f2f610 SHA-256: e3ff3b878f2ed55b325d84977ba6f99a00006fcef900c77eb169b3e4459bb3d6
154 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on multiple compromised WordPress sites, a common technique for distributing phishing lures or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs, particularly those pointing to WordPress plugin vulnerabilities, suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9527

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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f8e89330---jogezufepigef.pdf In PDF document text
    • https://detectiveoffice.net/userfiles/file/vobefawoxalegibigit.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/26016324568.pdfIn PDF document text
    • https://werbemittelag.chupload/file/48290911937.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/73865770962.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/34760423304.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/37601779869.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/92797570639.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1468c80bc---75991448985.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/28b6c4ed3d5fe728b4c88cbf7401a44b/dejamakenoturu.pdfIn PDF document text
    • http://change4best.ru/upload/file/vojuwab.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/59788e194fd65021ec2168d2300fbf25/tugipomepi.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/24514092447.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/korexab.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/79446477521.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/foremonirofikosiw.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d63b80e31a1---64040699156.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rsbv1ipjd2g39daosfa9ds7a2a/tapinujesaluzulopago.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/f9q6ih4hduno9i29li5ddn693t/13842649776.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210528133250_1288656252.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/simuradovonuzelu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccb12ba3d5---fujumubunitijo.pdfIn PDF document text
    • http://tayles.com/uploaded/dodunanojowijizimudigudug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=arduino+language+reference+pdfPDF link annotation

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