Malicious PDF — malware analysis report

Static analysis result for SHA-256 9888d1cbc6b967c9…

MALICIOUS

PDF

40.0 KB Created: 2021-09-18 03:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3c2b1a2b4703b19359c8ec618d2c34d SHA-1: 213d6f8b5c926a78783d93bd49fc7d21ea61269e SHA-256: 9888d1cbc6b967c9d99eda5a5d98d7ab365884aba668db2767598119ff0d497d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Heuristics indicate it functions as a link farm, redirecting users to various compromised or disposable domains. The ClamAV detection and ML classifier further support its malicious classification, suggesting it's used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8966

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 40 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://crysiq.ru/uplcv?utm_term=samsung+dvr+app+android PDF link annotation
    • http://recviem.ru/img/upload/sexiwaxobobawiwolukewi.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/xumavuwusawisukipewefas.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/65071668721.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/36900510660.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/re22pa9q68e21es1fqqq96nrfq/tojer.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/katenir.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210913165013.pdfIn PDF document text
    • https://epiphanych.com/images/file/witoputekoz.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/dipapemavolugarerenu.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/bebaxifisof.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/4ei4bm995qb126gro37pc0jlk4/polekep.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/dodokewopipemobijoledidu.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/66115488548.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/jezigane.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/35490053520.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/97321145795.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xagolaxipurosot.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e137ac40cf6481d7fcb463b624b6c00d/wujipipibos.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/76211118801.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/sumibuferifiji.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/fudogivesunoxefow.pdfIn PDF document text

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