Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2cb4340e4ccebc…

MALICIOUS

PDF

93.2 KB Created: 2021-07-01 21:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 118ec07a190faae02af373adfc480241 SHA-1: fe5a2e44cd4d90a3484020d783704bd589eed942 SHA-256: bf2cb4340e4ccebcfa27b1034df81e623cdc03a23763a8bdca8eceaaa4eb83c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to download further malware or engage in fraudulent activities. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and heuristics point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5d15536c---gekepuxuzaxesivepigo.pdf
    • http://arch-teh.com/pic/userfile/16605554220.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d9815b13f71a5fae1573db437486ee6e/goxibuposisiw.pdf
    • https://alteanetworks.fr/img/file/89228976457.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fd303befb729690cf3460e2c01967c37/ketidusixula.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/68786de0a3aca7706a6f843d1da52e67/23291892225.pdf
    • https://wonkingchina.com/d/files/sexabujoxexikufuse.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/bfef75bbec9c4512e63f4df8af9a55c4/40032899418.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/10641695f9e15ec888a0449b4caaff81/paliwamusivizoxoda.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/6a23b83cf3c6b25dc04dd9c2eca7feee/23145050913.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/55413970023.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ff7b8e402e43aa939928dbaf2b484bdc/41610558265.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/cd919391bae071afb54f48bc2c832c9a/zasifi.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9926a4ebc---wafagululizeratu.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c23bf6938d5c09f0e28ddf53835bb9f8/fasare.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/chg5e7haur4fepmk0m93dbe8r3/50535355027.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a747868dc1---87461145183.pdf
    • http://candientuvibra.com/images/file/duginugalesewugunogef.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/jojezomesigedugo.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-28/20210528000038979386.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ad8b7c74d---gijaziki.pdf
    • http://aucoindeshalles.com/menu/file/70318279854.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160866b05332bb---varodemagenumidum.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae328c726---tonagufiz.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ab6428ec7bb65c2dab1decfba2945d87/lumovarowevow.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=blue+glowing+coconut+octopus
    • 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_off00010ac8.bin
69424bedac3f8aeb91b929ba04c7d537afc52efc6351ca9445b0fecb4b2929a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 17020 bytes
font_01_sfnt_off00013752.bin
74400c8e70ebfbd2fbe1590ab0c2604daca3d877a56819089e7a39182daef218		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13752 10524 bytes
font_02_sfnt_off00014f84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F84 16792 bytes

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