Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa5d4668c48eae0…

MALICIOUS

PDF

42.1 KB Created: 2021-06-25 14:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3cda652fe9059d955193b5c35b1dbeb6 SHA-1: b89e4baf410ea558a4745f6e3e7f23930a3fb761 SHA-256: bfa5d4668c48eae06fd8c8a82dccbf370d4e80c9c86f1cbf241719c793c70fd5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.6979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kasargod.net/uploads/file/62362611973.pdf In PDF document text
    • https://ikansambel.com/contents//files/10221647722.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078be0c8b3a4---97769425258.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/soride.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607632f939223---13669647331.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/736af99b1bc784b77aae7ce30544c185/77640389225.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/30719192439.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfbc10dbf2---99840365389.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/9328d0d76032edab9b452a127341d0ed/xeworatariwuginuwepuwizow.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/99963546753.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/wezogi.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/20520899806.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/37345454989.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/kajikigufiwumite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=aes+encryption+in+javascriptPDF link annotation

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