Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e85a7ca5aea970…

MALICIOUS

PDF

42.8 KB Created: 2021-09-07 08:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1bc933f1462218c3dce317907e32756 SHA-1: f77fba1fcde305d14a15e3cff71f97b2fed4afbb SHA-256: 37e85a7ca5aea970395844f16c511d62cd6229ae66dacf70ca5e3872d9b11c42
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with multiple URLs hosted on compromised or disposable domains, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lure users to external sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8037

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://avgdesign.com/userfiles/file/21174272431.pdf In PDF document text
    • https://jagamimpi.net/contents//files/1822382106.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b08b5d5df72---gomuwadimumu.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/399495c894c1335c309eed5bc0bee1c7/35161987123.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/26582066521.pdfIn PDF document text
    • https://masukpt1.com/contents/files/88972465754.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f33622f06---xotanejobosufafamaxopanid.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6fc9e20b---79248702495.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/pinide.pdfIn PDF document text
    • http://texmet.pl/userimages/file/64265249925.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bodiwaripapepidowumipi.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/73470b74a1853b7b7dd302bfe4f3e7ef/11017182344.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/gizuforonomejop.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/17532865333.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ohq156usdofvqnmkqf4veskjrf/95248164282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=adobe+illustrator+bangla+tutorial+pdf+free+downloadPDF link annotation

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