Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad3371c593b79b7…

MALICIOUS

PDF

77.7 KB Created: 2021-06-28 21:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15dc4a9b18d8ac5081e8e774c1c213eb SHA-1: 827ad6a64fc16144f6d7c64f27024a18037b5716 SHA-256: 6ad3371c593b79b7db851e70d3a8ed19c5195a2beb898ee663c82d0be7422b42
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or SEO poisoning attack. The embedded URLs are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8251063cd55e6d949c37629c76c33d1a/mabaduzakib.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223ae2131b---xibenaxinebofolixo.pdf
    • http://amon-syotengai.com/userfiles/file/jisexogapi.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/8745ce25d08326b239df5136888dc947/19756970595.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/waseja.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rb11tntqpcpvul0u5kkfl01icl/latefebiz.pdf
    • https://beytarimcilik.com/admin/editor_resim/file/bazumikoni.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98291b718---93060152372.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cef87acd0---57281973352.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b26030aba9aea9c13a2a9f1f1a3f747b/duluroteneleb.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5c0d48e57d9bb71df357e1b65a0f0931/95025594033.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c4a23121---69558420582.pdf
    • https://amrapalispot.com/userfiles/file/52268715508.pdf
    • http://kaupa.cz/userfiles/file/fakeridevuselonu.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2b2d08d97---342293361.pdf
    • http://www.predia.cz/userfiles/file/79376624081.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc3b05515---21049655891.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3177f2d70c347b732d1c8600af26b5b/gizadazujefiburirudum.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bdqlr3fgbaj6h3a6l4uff7du03/48992515548.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd676f2040---66791763353.pdf
    • http://cuatro-pr.org/sites/default/files/file/62618630389.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/47j5e9tg9tn6a3svf7k2rfvhgv/mukimowakofejefijatirebu.pdf
    • http://kotolantopeni.cz/file/33653590569.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rick+and+morty+back+home
    • 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_off0000ccb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB0 16792 bytes
font_01_sfnt_off0000e4c7.bin
cd66f8d4f6167935db3319ce904c1425165a2f7e6e5d6fafb3e5107cb19937e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 10812 bytes
font_02_sfnt_off0000fd8f.bin
b28b1ff5e7be577ef4438dab89667f3cac12bef83c6ebdb5a13be4150b29ec70
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 16800 bytes