Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9afdaea54fd182…

MALICIOUS

PDF

85.4 KB Created: 2021-06-12 00:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9d3d328e954f89060d81bc08c9cfc844 SHA-1: 9c644115872a8667e5ccc1081314362c9f435e7d SHA-256: 8a9afdaea54fd182ed76712a99367fb02f0f4851396e1967d852d3fbb2877a0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit user trust by masquerading as a search result for a dictionary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=diccionario+de+sinonimos+y+antonimos+descargar+gratis+en+espa%25C3%25B1ol+pdf PDF link annotation
    • http://atek-ent.com/upload/file/64954224848.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/l6odkinajt8l5eihkpuilkn2c4/gujonopa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ap7rm60fefert86qdu7bo4e682/25294885328.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608891d05e180---76946699662.pdfIn PDF document text
    • https://agermag.ro/mm/file/torededafutegozoromib.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c51f7e734ee8f8d08f6ee68537683bc7/didufogewofe.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/pevojozedanoxovuxa.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4b74ec272ec8ae021e4164df0a864ed0/12200845372.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7985115d34---10682830354.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/04f0c08b5534cba6420b17636263bd85/52376664379.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/63dd03758a5898ee1514c023d412e069/gasowijururadejaxuwijelu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609105e0e22d8---sesuxuvetipoxuxepabil.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/98938529587.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da3e1f02a---16279674610.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/3ep90b7bhpld0ljfsne03em8h7/vekufosimakujopuzagi.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/n83uollapnctmgdp77f304hnp6/zovixazifiwezalefapekob.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4dc0a5f28d7579907d7f4c453f4d37a5/leroluzoriroze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 5788 bytes
SHA-256: a6ca3758bd5f5be6e6fc5189ce978e2bc467a30522db2e38477cb2d491380d84
font_02_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 13532 bytes
SHA-256: a01a50c66c195c49f490e8bd98f396df0942b1a0e8a3b7eed0029d38a5393c57

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