Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a351d2a478fa3eb…

MALICIOUS

PDF

119.3 KB Created: 2021-09-06 19:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 554dc11cb76174e8df361182304da43a SHA-1: 3e9bd864b8efc27466874a95726aae0bef9b44cf SHA-256: 4a351d2a478fa3ebcd07f24b8252b42a75a8e1d8f77c8d56b4d380cde2e47ab1
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. The heuristics suggest the document is designed to lure users to these external sites, potentially exploiting vulnerabilities or tricking them into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6624

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 http://m2m2design.com/userfiles/92124766025.pdf
    • https://tangentemag.com/img/file/96322568307.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb1678952---batekuxixomonufux.pdf
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/berosigiruro.pdf
    • http://adams-gold.ru/archive/image/file/47959253372.pdf
    • https://activsport.ro/userfiles/file/89359419484.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cd5cb91403847529f5b8c833052544c5/13717513685.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad30eebff6---52734568142.pdf
    • http://abpaluso.com/upload/file/baviremigel.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217281527307873.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072733e36570---94364461931.pdf
    • https://mbamantra.com/ci/userfiles/files/veloputegoborobigiso.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/869d10c48b391ce381f7219f9d20b132/60099511007.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d017549628d---nexitexofizaxilujoginu.pdf
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/wujofevap.pdf
    • http://finproekt-msk.ru/userfiles/file/vedugakonazijeso.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1901d5c0d---36349140346.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/58738811421.pdf
    • http://helder-effect.nl/userfiles/file/34034998939.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210904_70EB6FBFBFE81931.pdf
    • https://cytairtool.com/test/userfiles/file/20210702_25b9e.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608057b8b3cd7---benivavejoxolomudirikar.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af94906ff---fifititerupivevifi.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f904721b0e3---lugesufeles.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=enoch+book+of+giants+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b9eb.bin
2c462b41d5c629e1a229f38cfe83e1edb5db904b47a3d683f4e1948500927d82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9EB 10836 bytes

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