Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0354c03899f0e03…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 14:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b3599a14e8b082f896adcd84ef7aa81 SHA-1: 17209e783b977fa34b3ae7ed263d2a061e9754e8 SHA-256: c0354c03899f0e0397a1d19813b6c281903aad1923b38a7eb417c4730430165d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://oppedisanorobertosrl.com/userfiles/files/salawubetudunejufevoza.pdf
    • https://ahirealty.in/admin/userfiles/files/bowoxamezupos.pdf
    • http://ez-surveying.com/htdocs/cljr/data/files/nigofedovaxafulipilo.pdf
    • http://an-professional.ru/img/files/file/vefuxejipuga.pdf
    • https://hondaotohaiphong.vn/upload/files/3888728608.pdf
    • http://maslatalaia.com/userfiles/file/tenaperajaku.pdf
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davume.pdf
    • https://radio-clipa.ro/userfiles/file/vufakefimefuzusosigubiva.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/842e686a72ff7e0774328f3795e31f23/65228513745.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k2m5baphpvv0g3cgg2glkcj4vd/dezinelomigitapasifetuv.pdf
    • http://eikenhorstgroep.nl/userfiles/file/guzal.pdf
    • https://trsoftyazilim.com/genelresimler/file/30394939355.pdf
    • http://studiosiciliani.eu/userfiles/files/lazitulepemurinow.pdf
    • http://swaminarayangm.org/userfiles/file/21683380699.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614de47f00d8b---70004613385.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614016d8541c0---metimilaparetemada.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161392b46b5ddb---vemonuwomu.pdf
    • https://irisapp.cn/uploadfiles/fckeditor/20210908/file/16310873096672.pdf
    • http://superfishinglewood.com/uploads/files/44158182334.pdf
    • http://soosanfix.com/upload/fckeditor/file/nidoxi.pdf
    • http://imoroz.by/upload/file/rimisubifut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mi+note+3+adb+driver
    • 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_off0000ad40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD40 16792 bytes
font_01_sfnt_off0000c552.bin
285c57c1e7ef01809eb71068d64e90a63450d761823b2a595e9beea6fee34e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 16952 bytes
font_02_sfnt_off0000f031.bin
07dfb389af834a80c5678acb61b73549eec3288b7dffc56d740b98cee8516987		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10400 bytes

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