Malicious PDF — malware analysis report

Static analysis result for SHA-256 12742c28e4d10afe…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 08:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a5d08e8cdae1714232a3292d77313cd SHA-1: cad10a89d7974e702ec7f5e3724713c77324d276 SHA-256: 12742c28e4d10afec757864c7d4c362ab81ba5d0741bb3e1c90d30fde40ff348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to various domains, including those on compromised CMS platforms, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://chcial.ru/uplcv?utm_term=jet+get+me+outta+here PDF link annotation
    • http://leebyunghun.org/new/upload/board/files/ledufibamenopedegivaj.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/33849505607.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052218093973499.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e392bcc321b0be2f6460dd5db2ca0bb8/gokapodosako.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/kuzowirudusatevimoluvolum.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d1242b39---93133646267.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/42971710481.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d366f79d---xutamaji.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae592fbe9bb---togekisapibivobitivog.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/df46588c052909126a0cda01e2367c6d/90270489835.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/zemijifisoguvezil.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/vanupovikipirudan.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/39408183424.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/supisudekafigoz.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/gutikuzinugodapomaxu.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/videlepinof.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/38243279235.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b88758c80b7e11e968b527b4bb70878f/nafujeja.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb351df2eea---verugelarepazide.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/1753969411.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b77e62546bc50fcbacab5388c08cf3ee/tudosanalepuge.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/bupokoribi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcd922b300---31746902088.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/144062429061046b404fb91.pdfIn PDF document text
    • http://waypl.pl/upload/File/potikidifoki.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f8e11e94b---84673593027.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_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 10236 bytes
SHA-256: 29459c2cc604eba132bde4658f0704394c9ccc961e8567ac6573fda787e473cf
font_01_sfnt_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 17776 bytes
SHA-256: ce7225a79e7ad69c7d4af6080bdcf76e2bb4150b6a9418ab46ab28a17810aee7
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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