Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9c512af92a8c50…

MALICIOUS

PDF

56.3 KB Created: 2021-10-03 17:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 03952c79decbc7ebefc4e83f9e300322 SHA-1: f8f8dc9b94c8e0510593dd3254d125912c938212 SHA-256: 3f9c512af92a8c5030b23166a1ffe00b4ea08621a63314ade9af1d418556dff6
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and is identified as a phishing lure by heuristics, suggesting it's designed to trick users into clicking external links. Several URLs point to compromised WordPress sites and disposable hosting, indicating a distribution mechanism for malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8953

Heuristics 7

  • 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 56 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=careful+decision+making PDF link annotation
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/1516415557.pdfIn PDF document text
    • https://finliz.lt/i/File/nenosititapanotizevazivu.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/tunujegenovopibexax.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/kemafu.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/46891456705.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/60394254629.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/61731816853.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/63262874470.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/16752819822.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/linowunawanimaz.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137128c7e1fe---5556078809.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161568bf0aded4---niwawarivew.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/68899667643.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/xadopivazimepi.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/19582085812.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/34673837404.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/24374889299.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/545530e830de6b9548106c5dd743b700/bitifapatevegos.pdfIn PDF document text
    • https://ratodua.com/contents/files/28863880331.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/guxeliguwodasige.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/73178994394.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6C 10944 bytes
SHA-256: 601b0e28831b497f925a3da823f9af9e4f066d3471f6b870ffe1ed78103d1096

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