Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd16168eb11be34…

MALICIOUS

PDF

95.7 KB Created: 2021-09-08 00:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb7c95b673766632ce454388950e7852 SHA-1: 9f20d4d2b2eca53a69b40452b180bcf3f4ce8990 SHA-256: 6fd16168eb11be3410f277168628a0f3c8274744ef6f5e77f0b8d1a73eee001b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms on disposable or compromised hosting, suggesting an attempt to obscure the final destination or leverage SEO tactics for distribution. The presence of these link farms and the overall structure indicate a phishing or redirection attack, likely intended to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6122

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://accu-split.com/userfiles/files/74738986933.pdf In PDF document text
    • http://wumag.pl/userfiles/file/wedenolunujemamekov.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/45814896847.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/terujasarubolu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ftj0quaufutkp3hre59j6goac1/34151497679.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/30363467048.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/liximokopofavajot.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/72587216013.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/89923536728.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/74783904790.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/86047126715.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071feca0e3a9---58061417431.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a231cb14d27---wutenagawatu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b28119fb51a6eb78bb826a2187a506f6/kolewuluzoxowovubone.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add45100cb---taxanuvefetal.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/kiwexafaxemu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/wazedederisoboronifik.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/fovafexenubupavakum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=test+de+creatividad+infantil+pdfPDF link annotation

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