Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b716591342a3a56…

MALICIOUS

PDF

39.0 KB Created: 2021-08-27 01:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e7ff71fce94ad0e23a13ffde99819f99 SHA-1: 6b7c587ffed362abd304d12e5cf2b448786403ae SHA-256: 3b716591342a3a56272ba4a8aa4f39171b1767a4b9d5e4fc7cc47159d7c3ed8d
174 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various external websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_IMAGE_LURE' suggests this is a phishing attempt, likely using a screenshot as a lure to trick users into clicking the embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

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 39 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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/474061677e574a5ac323b58969bfef8f/22749101038.pdf In PDF document text
    • http://ghalemdi.com/userfiles/file/5825622827.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/kavefokif.pdfIn PDF document text
    • http://zubrcup.by/files/files/71078117428.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8533e22e---44151014343.pdfIn PDF document text
    • http://guitarenko.fr/img/files/nuwovapukasekobewor.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/bixotag.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d78bd52c10ac5268532903e31fc68ff1/gakufuniwo.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/rabewoxedijofet.pdfIn PDF document text
    • http://peoplefoster.com/pliki/xafajigopavifawaripuluvo.pdfIn PDF document text
    • http://meskerjager.nl/media/files/88658168521.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/fuwixovobipodife.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/87798078167.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0831f8d1475b8ca173059413a239f33d/biwozalofemesurunovot.pdfIn PDF document text
    • https://cncunse.com/d/files/vekuxakutixujug.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16078ffeee4f1b---wovifikapelutomagidus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=1+bed+1+bath+duplex+for+rentPDF link annotation

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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