Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a182ef5c83155c…

MALICIOUS

PDF

66.8 KB Created: 2021-06-09 19:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fdc495f72edd3f07ee54c96f7e9d3843 SHA-1: 118ac9e1d648045cfb9f096e23541577e923c92f SHA-256: a4a182ef5c83155c11514e7668b3f2f6b9bc0c61da3b35d4ff5cd0952bdcf19c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8125

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://medvor.ru/uplcv?utm_term=free+roms+psp+resident+evil+4 PDF link annotation
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/e94d24d23e282482e5d3b004599daa28/zakoxiruxomuduzukagu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf31edd07---nukiganabibo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/929ee38ac796d6efe50a0d1ae083dbc9/99631238055.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f376dccf47---bopogetetugapufatanota.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e5f71c2bd3659b8b60bd1f8d897c5cf4/11691529142.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/69124646505.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/4360261999.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/pujamifufalujiso.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4ed82fa7e---70023039105.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/41925588225.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/48022581951.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/74626f4c87eba07a4dcac3fc8b84c3a8/84899164573.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/rvcugmqruull6td9dgo5c2hg0d/4007350665.pdfIn PDF document text
    • http://envigest.cz/upload/file/gumuxalofiraminewo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 5000 bytes
SHA-256: 6798be4b6f50d0a595bb080778a3c4fa58032d9e7a26ca2acdd8e90500b1c3ae

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