Malicious PDF — malware analysis report

Static analysis result for SHA-256 515d509ac52bf893…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 14:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 274893dbd1a9b77eabe92c08ce9c33d3 SHA-1: ea04bd775e26ebe1aa2c0e1a7f35080009890b7f SHA-256: 515d509ac52bf893ff056c2506b7fee654d6f07f70fd0f24b10f97f985575db7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://almuhja.net/ckfinder/userfiles/files/78671816772.pdf In PDF document text
    • http://cuacuonanbinh.com/userfiles/file/revutajuxe.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/47133228448.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/zoxubajojepuminudim.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/miguwuzurozurekupagumozif.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/fukajupesedureveso.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/6894020013.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/ruxezejitogadore.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26175dc058---wiwuwarigutujilibowigu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611558087c98d---26116332654.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608921f191bb6---89760502750.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/tosofumavilovere.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/javizamiwinigasuz.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/30839717830.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0ed4960cd6fba96a05472243a8e662a4/11331964142.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2e6883f1a---11121331726.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/kezowizixaxivazil.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aee1e6b7ee---16986521001.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/rifudofefapaboroso.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/85415247970.pdfIn PDF document text
    • https://mbbs.hr/files/pemoxowabobeviga.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/49178187392.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=convertir+pdf+a+excel+software+librePDF 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_off0000c2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C8 17724 bytes
SHA-256: 1653c738e76d6858df37d890809b7f7a2fe6b9ed505c493c351406602e50a1ef
font_01_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 11040 bytes
SHA-256: 6d11a4a2b3ee4e4f86d224759b8f6663fd5a644d50741b1340096a8d398a6da5
font_02_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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