Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8aa92b95e778c5…

MALICIOUS

PDF

79.7 KB Created: 2021-08-31 15:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ae2d83d5c2c4b68d22e6a36b59ca693 SHA-1: c9239e083d786f0393b46d7a6839654932acb651 SHA-256: 4e8aa92b95e778c5fd9428980ca051a84b49959071e5a68d101467c63b90c96b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://skrabl.pl/www/rpbd/fck/file/tomotow.pdf In PDF document text
    • https://martensmgt.com/business_school/uploads/file/kobijujib.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/25849726517.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/56770003886.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jltd762c9b563npdnsglmhcgj0/rivow.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b56o28a1ejhfn383gl1fheeqv/milapekikuvonevexusezat.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/xomijofago.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/manubom.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/witorarapojevubiladopiko.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///sopijikibatoj.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b975073f6---zulomavudonadenirow.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/ranuvuxelalufulexujex.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/1750507556.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/11537485985.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/tiwuzik.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071991b3b8e7---zagolemu.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/71088261036.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb3bde12ce---2842571991.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/dukikuraloluviro.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e668b3e1a1992df2d6a687030159c35/xesifomu.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/gimeverojogotiwus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+convert+pdf+in+imagePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161269285f081a---nikozixodofiletip.pdfIn PDF document text
    • 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_off0000d30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30F 17696 bytes
SHA-256: 68425b3e82a7921890dd8b5202a0368a570dc827ae6a1df5c51fe0ad2f314f2a
font_01_sfnt_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 10892 bytes
SHA-256: bbaa0f1840c609be1b9573e9f0556904afd8b6f58cd24387a62a26f9e3434119

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