Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56229939c9f47da…

MALICIOUS

PDF

87.6 KB Created: 2021-06-25 19:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9983d0f331cb42d8381f7e76d43449f SHA-1: be572d30b30b7115e5a78053839fa0729b2deed8 SHA-256: f56229939c9f47da131a5f3a79ce69bcf75a27c5d66d36066f5c1b3dbe31543e
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF structure itself is designed to obscure its true purpose by presenting a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://communeouchamps.fr/userfiles/file/17415706055.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2395a5ebce3690d6fab2006098c6f529/33966985322.pdf
    • http://pnmanagementsolutions.in/uploads/85374359792.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b2b679e5a725d03640d29f6902a0dbff/tejifikutijipobugoned.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/9bi9lmjgcvhs9oo4m9u2c1oov6/23730791450.pdf
    • http://g-shocktou.com/user_file/file/bamitupekuvozafori.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/s6v4i4al0lj2vrekng1o02em1s/48375565088.pdf
    • http://alt-1c.ru/userfiles/file/45814198894.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bb56a8297---53207358537.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082639148d82---nufikomifaferewakanub.pdf
    • http://tradeweb.es/userfiles/file/wujipanubefawalefij.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b3a8688b---waveguneravetixo.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/387e5d89613d1033f28bea3ae7f99823/45289468521.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c470a9e2441---fovozoboso.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4d1be574---66564827576.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892e6d57e36---12888286474.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/vqv5gu6plubkjg7cv213lodt75/98390544281.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f763c92b7---bofefapazukonotovolukak.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73bafe5303---soluzabiwebebegowalabaxi.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/cunce406joq8utooh5uq9p8cb0/18219090798.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/640934bbe22b56cc33439c0cfaff2b0c/90604474703.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/de1h0oomvmhnmadn1fiaspb296/begegipukekivixu.pdf
    • https://callalilyvn.com/upload/files/23147408928.pdf
    • http://arci-mp.fr/admin/File/3248474750.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3c0fda1bf---butibuzuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=audio+rosary+with+music
    • 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_off0000ef94.bin
05e5c1f375c4b649b5e8376181f62b594c2f50484a2c31531126ff9b5bf2a950
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10636 bytes
font_01_sfnt_off0001080b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 16792 bytes
font_02_sfnt_off0001201d.bin
b1bd327788297fd4e65d29206a6d98c5070c101110aa4cd9de6d5c5abd4821b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 18068 bytes