Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d5ed8746604dbd…

MALICIOUS

PDF

86.4 KB Created: 2021-08-13 18:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7235bc4864e091fe9ba5ef818695fe7c SHA-1: 82ac490686003ad447e76ade0d8eacf891f8ca6b SHA-256: b2d5ed8746604dbdedef26ff8a390a271d325285375afe2452884a0413903317
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which host further PDF files, indicating a link farm designed to obscure the ultimate destination. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests the document's content attempts to trick the user into installing or connecting to a remote support tool. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload via the linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://bugaboo-buffalo.eu/UserFiles/File/27935898222.pdf In PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/8604780023.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/nulobujuwonudenunene.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a499894ed86---ruliwixamupobofusir.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/xuzatokowunowuboze.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087120d9473a---62292313303.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/b61d2c1bdcc2a2ecac927259e1988be5/84612753470.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790286a8c8c---39660525533.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/ginulogoseneka.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/dirifosaral.pdfIn PDF document text
    • https://electroagro.es/pub/files/lofip.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6129b025---23032841936.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/36f50522919253524a0caa9b23467c3f/lujutelufokatiluxozixuxir.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/3pjnrnt2o2dvdfb410g90qa5bb/12368875475.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/zibep.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e736fef4f4---24720292944.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1d525f5c5aa4f68e2e34dbb3535742b3/nojusatagisawaleg.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/63524911000.pdfIn PDF document text
    • http://artospace.com/pics/file/pejuzinolilutovipa.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5f95dc8d---titonumafipusagivarati.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/juzuzonugobufilanawuzoji.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/8da534efe2024aa4269b7d1d56da918a/1763611419.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/19887d5d59db264981ab5e515bb42677/77966135577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pes+2019+mobile+patch+android+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 16572 bytes
SHA-256: 9f70777f2f5dafdebc55a7db2f9286e5b4ad9cf4e8c192ba06cda2b74dde65a9
font_01_sfnt_off000118fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13112 11468 bytes
SHA-256: ef6f1c80524124b06233bc220c52ab8f71d61ea79f0869c406c203d6f3af8814

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