Malicious PDF — malware analysis report

Static analysis result for SHA-256 426098d355eb36d4…

MALICIOUS

PDF

63.7 KB Created: 2021-09-20 23:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24f3b145211ed8f8816ab567cc917add SHA-1: 39f978342cd42baf9dbe73ce38a812659044b6ae SHA-256: 426098d355eb36d416928d216508deb7fde222bc7db60f6457fe4de27e6aafd5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9231

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://drafthe.ru/uplcv?utm_term=android+device+manager+to+unlock+phone
    • https://muguet.fr/sites/default/files/file/butojiretigojaworod.pdf
    • http://ecme.site/2015/vat/upload/files/58688327935.pdf
    • https://bloomeng.com/uploads/30745483158.pdf
    • http://akcjonariusz.com/UserFiles/file/86665308419.pdf
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/15115700519.pdf
    • http://edv-denk.com/userfiles/file/gususakenulopotenejijir.pdf
    • https://hoongnau.com/upload/files/xoxesu.pdf
    • http://yeongwonenc.com/userfiles/file/59768171067.pdf
    • http://ammk.sk/userfiles/file/6830013758.pdf
    • http://haithuanphat.com/uploads/files/raroketamugiz.pdf
    • https://turismo-galicia.es/ckfinder/userfiles/files/jikamipe.pdf
    • http://ctnphrae.com/ckfinder/userfiles/files/mogimitamiroda.pdf
    • http://ekstelekom.com/userfiles/file/bazikizeleba.pdf
    • http://veganogle.es/uploads/ckfinder/files/19493326574.pdf
    • https://ladangmimpi.com/contents/files/sarapofisomelave.pdf
    • http://struttur-arch.it/userfiles/files/55700225471.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/93513296568.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/fogupujamokakaje.pdf
    • http://reklama-kemerovo.ru/files/files/17772825829.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/83b3d5d07f62acf35a934e78d4bf34f0/tukapidawofu.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/edff2412f686a729bf60ca97931ca049/70237264704.pdf
    • http://avvolodin.ru/upload/file/rebuzolu.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406bf0a6cfd---xigitavuwidak.pdf
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/50307762563.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_off0000da6d.bin
5f308a8446fc591473a30ef14c8023ba59911a7b842e932e68ba4c488cb0fcbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 11032 bytes

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