Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c5b4423b040259…

MALICIOUS

PDF

42.1 KB Created: 2021-06-19 13:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a1d22d6779c3a3c240dbe7da293ccd2 SHA-1: 7bd718ba2306bb7fa88bc94eaa2e53e2983b3261 SHA-256: f8c5b4423b040259eb422380cd8709834d14dfd842e5b8a20ce1a8f79909242e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7539

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfed0a8111---85385926069.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f834b4d0fe---61221270546.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sogozabulazefaba.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kad18uusfjne4o4mm5tp83sgjt/76143181003.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f42110c619---fukadetimawaregazole.pdfIn PDF document text
    • http://sport-way.ru/img/file/82944779049.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f60a23d1fd62fb28ee7a1b5f5e430c7d/68691006557.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ce19b5cd2ae4ad91d4f37062e0c99cc7/68277718065.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/89565518532.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b855bd9465c---gukodinimekalaz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/robinetutimivo.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ejtkf6qtqg83ac1fk5bkpp3oj5/39095816465.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/53721602669.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xumeladesopenuzux.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9b3629085880f0aae8fc1d04cac09ea/54185365855.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/15426498071.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a8c23682dfef3394ea25a1f836871c49/56156338482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=siamese+lynx+point+pricePDF link annotation

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