Malicious PDF — malware analysis report

Static analysis result for SHA-256 911f95b07e36ebf1…

MALICIOUS

PDF

65.6 KB Created: 2021-09-21 12:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8869da6a21551d73952caa2dc492ea8 SHA-1: 6262efe802309a6fed0e6192353f1405359261db SHA-256: 911f95b07e36ebf12db49bc6d553c8c93526ec4dc8206b5a631d483190a33178
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware. The presence of numerous unknown URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9512

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://hoangnhataudio.vn/media/files/jaxuzabinoz.pdf
    • https://podimercrm.com/img/files/79473439463.pdf
    • http://mp-journal.com/media/file/62662361642.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/86098t01vr5bllo9tjm9jegs27/70169983908.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c7035a62---vugidexuvuxuziwusepinotez.pdf
    • http://teusz.pl/UserFiles/file/ruvijozu.pdf
    • https://esvigo.com/upload/files/57252496092.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/0evn5dfogvrkj7ho417a9ub6e9/katefi.pdf
    • http://www.vinoplaza.nl/img/upload/files/jolarizajuwigek.pdf
    • http://sieuthibds.net/images/files/11483706766.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/2370b16fd378789f62e0bee785fe8340/fuvepuzexusiki.pdf
    • https://minhvuongthuphap.com/upload/ck/files/zamarawojomepaduse.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140e42384be8---jarugivupefu.pdf
    • http://psychologadamczak.pl/userfiles/file/44817678647.pdf
    • https://projetovm.com/uploads/files/13177909433.pdf
    • http://hzkontejnery.cz/ckfinder/userfiles/files/30017550798.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/95721098615.pdf
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/filolofuvinufewaka.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2b918bc8---fifodiremuvoviwafu.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/liluzoviparipafukid.pdf
    • http://fabiocaronearchitetto.com/userfiles/files/9849587672.pdf
    • http://jsjxh.org/filespath/files/20210914102620.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=windows+7+genuine+iso
    • 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_off0000d776.bin
907b27886ade484a7760fbbb2754fe6c2861869222c05542bf37d7d690b2cd5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 17500 bytes

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