Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a0a5937e3701d6…

MALICIOUS

PDF

96.7 KB Created: 2021-08-06 15:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6b856fff85c7733f991d6dd73785ad47 SHA-1: 125e18cc709dff194a5d934592d78d8332c86c23 SHA-256: 95a0a5937e3701d60865b3c0330064989abd9cecf6d255b28f0965b4b3fd0e21
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other potentially untrustworthy domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://epos.nu/ckfinder/userfiles/files/sujutujizikorebo.pdf In PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071504e51baa---64272563115.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd9d00aec9---46117140445.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/pepida.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f57f7c093---kapelig.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088894217896---48194323397.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/jokeka.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfecd97bb23---16814018571.pdfIn PDF document text
    • https://nevisnews.com/userfiles/14728366000.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cd387e93---86770748835.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/galusawajef.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/76d202399e3d634931d5bf0d2fd0f0da/xavikevuluwazorulorej.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/36126629014.pdfIn PDF document text
    • http://sccsfz.org/upload/renuxakaxezipuda.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608204e110d0b---6775851416.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/88609438217.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/korunakavirek.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f767d8f5445f4050b4089aeee9fae0a7/54238345813.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3935a942---padonajelidareperi.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a9b773b3aedf0854d5796c2215a4be08/43819520669.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/takerotoriwipasumopidog.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7a586620---xasebilemegizebikuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=statistical+reasoning+for+everyday+life+5th+edition+pearsonPDF 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_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 18540 bytes
SHA-256: 4ccb07b99e27b7abde44a52212d1848bfdd67a680acff118c5214f4b19c85ea4
font_01_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001593d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593D 11288 bytes
SHA-256: a2879f313d5294a9fe78a268adccb5f6f2476af666337249d81049e46aa36871

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