Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f4e76bd7ca3472…

MALICIOUS

PDF

87.2 KB Created: 2021-06-28 04:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5693e15e142f77cbf6cf58e2add58ce9 SHA-1: be564f007c426e2a94c64a52926e8923da8d70a4 SHA-256: d0f4e76bd7ca34724bce6f3ccf7b44356e64c6c9f617f7d2bb68409ab74b76a8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://oniceh.ru/uplcv?utm_term=a+raisin+in+the+sun+guided+reading+questions+answers
    • https://cafepiolho.com/uploads/assets/fapuwudusotanapu.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efab0929f---zusafexedasa.pdf
    • https://albawadiroad.com/userfiles/files/buxiwurozifewoporeruriwur.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/239247925dfbddc14ad295a8dbb75673/57913457101.pdf
    • http://alnadaoil.com/userfiles/file/5342172844.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t4qmtlir7n0t9ltf0pfnn971c9/98748306427.pdf
    • https://sasalidayanisma.org/uploads/file/47476513584.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/giradunemegiwesinem.pdf
    • http://orchid-daikanyama.com/userfiles/file/gufukavudanelanotevusobo.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h21fat0i3f3cmul603dhdbiu4n/tugejasixejifidoberetaj.pdf
    • https://accuratesearch.com/userfiles/file/vaxolaxivexino.pdf
    • http://shinies.ru/img/lib/file/86541864923.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160991970b02e9---80788981971.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/98629995730.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/u1lfcg92glaj1md16b0v1ulge0/buzezavifozapubetix.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45c1e73e56---logulafojutifa.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e05287625---vusovapise.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5de3939f31fdf088cf565d1ef787936b/59493369571.pdf
    • https://unosms.us/userfiles/file/42967823720.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b741011ce2d---kawadazenoxadolona.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/atbr4jgb70ad2obi01rtd2d53h/61993937543.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a10d9d40ac3---zonaxofelunulene.pdf
    • http://muaah.ca/userfiles/files/xiresefuzuvelurilu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f639007e4---39821157126.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8232a81a15---3352757076.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e82677115---18257761082.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/duk9483hh105fm4p2j5sqhuk8a/83324804957.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/349e0is9pm1p27q8a4esshn5g8/barofozevokawufefez.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f010.bin
cb7638ee1c7e58b64aadaacaaec09e400bd48fea93f2c6f8595013c29ae46f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 10792 bytes
font_01_sfnt_off0001086a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 16792 bytes
font_02_sfnt_off0001207c.bin
bb3b37fae99744c9e5236834c48d39e39507a0a3a5c0578fa691f8ec644a4208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 17712 bytes

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