Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f671c9dbaecc32…

MALICIOUS

PDF

87.9 KB Created: 2021-07-08 01:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9245aee55c0bcdc9704ba412be12a95a SHA-1: 5c2fc65c72bee8989c87defa76ffb0c475c80be5 SHA-256: 66f671c9dbaecc32b2432213e71d7db5fa7093cc94c2b78ae26296ab50edc15a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and compromised CMS uploads suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a6bbdc5714ef28eee2fec152c00f8e63/nikubifidewuworuwe.pdf
    • http://www.euro-fly.eu/userfiles/files/33685685535.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ac5eaf2d---jesovenazupewidawafapel.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/juzofe.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b340726a1---12009265453.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebcf27ef72---juxol.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ebbec7f00ae8f86462a730209d59278e/pofedu.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f89ca6655476d501d0f7f93b41500422/88506287539.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/81g87f7lvvvrvicsoh7kfn6kqm/kavalomebezevo.pdf
    • http://mosvag.ru/img/lib/file/tinusumijedajagepilopov.pdf
    • http://architects-desk.com/uploadsfile/wemoruzevawitibepu.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4c64f0feb46537a089193dd5a1123f7c/31466915566.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b24c31a5556d3e35ffdcdd13ccf46b8e/41839383326.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5d03c918f5164b5c5825444a6998c63f/93819202532.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0a125d3e1---62181770901.pdf
    • https://signika.pl/Upload/file/zikonowotiponagogo.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bff0a67f6df---refenefejujeri.pdf
    • https://bursakaynak.net/userfiles/file/veronidu.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5033092c56---87255226576.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4ac8efffd---muwub.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/bf4e4fb2cbfed2b1fa3468ea040e1ad8/nosugirotigakezibavanil.pdf
    • https://vansuloi.com/uploads/userfiles/file/19526901614.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a3d22a6559404b72bba3453709076b99/duriwumejozog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=following+written+directions+worksheets
    • 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_off0000f354.bin
f995201529ffa4f29f96a9f878063a7c790906184cb4787f7814212e9eb26392		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 17824 bytes
font_01_sfnt_off00012208.bin
599d350a0f0c6f727f672c2ced48b6cf15f8c7e95ff4c5e95744ba3cb12100e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 10640 bytes
font_02_sfnt_off00013a24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A24 16792 bytes

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