Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5afd0f4f6c64b23…

MALICIOUS

PDF

136.2 KB Created: 2021-09-06 11:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 316abe0ea0068cc52c623a7689f658a6 SHA-1: 036d3c2441003375d1b78227e17f5e59698887ca SHA-256: d5afd0f4f6c64b23b5c38cc47ad3656e3629e7a4c7d215cf9ab237aa83610569
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external links is the primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7924

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fertilizergranulatorprice.com/d/files/dopokokumugodapukuvopasel.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c9c334ab345465729b11a24bf3cb2d95/11498718392.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/89938852713.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/75096461457.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/vunagakix.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/okvvr27ldstsn0q731l6kn98hr/15955737507.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/12116902934.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/39479032563.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ff96124da62b31e35112b5077d620c8b/74814535288.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/texibupofojiwese.pdfIn PDF document text
    • http://nature-revive.org/files/file/7947483856.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/47705444522.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/zasexapeb.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8c77fc7e97962559c96e6127359175ae/61560150356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=origen+del+universo+teoria+del+big+bang+pdfPDF link annotation

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