Malicious PDF — malware analysis report

Static analysis result for SHA-256 2658f34dcca22fff…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 07:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b39cd33704936f08a54750a2856a52d SHA-1: d7674dc136f66325869590ef61e288dbb1094b04 SHA-256: 2658f34dcca22ffffe6817e6c8ee7c96222dd2859eb337226ad586aac908c49d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ketchas.ru/uplcv?utm_term=gst+journal+entry+in+tally+erp+9+pdf PDF link annotation
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/3cf1eef972d5644cd4820aba46b19bf3/72426940479.pdfIn PDF document text
    • http://com123.vn/uploads/file/razurufexazepedemasope.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/kenexataxamuxe.pdfIn PDF document text
    • http://fittbike.hu/files/file/bujazur.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/wiwugavisipe.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/gufekesekanubu.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/monidaroji.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/kp4ha23i79ba3d3u9bi192btea/95138096609.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d086e4cf---menexasivanupavidimofe.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8c8b3c2a4---vonovurip.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/sogobus.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i3ndkpb69luescpsns6db1t67g/6247944464.pdfIn PDF document text
    • https://menu2uplus.com/images/file/vufagavikonerivesovur.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/dipafapadivazotupunufat.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/418e837c9ef092263dc2bc15c7f64a65/lakivikinokepemavozepov.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/db62d91a829f8ddb453b7c74499412b3/gaxugeseb.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/71309ce2afaca07c56b60d334edb702d/83833617487.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f2d8186d---pojudibalenesevezame.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ae91c317d58e470ff7831a4ab1e83975/toworinimiwopovom.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5abeaa3879---vojukavaledowivasok.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/80403590817.pdfIn PDF document text
    • http://sns.hu/_user/file/51596892043.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0600afc16---52558682373.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607620c43bb06---71108910247.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4f824e6e3ac28450feddd1bd720782a0/sikujivisu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/jilupiwaxamikuf.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/negotibigixerusi.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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 11040 bytes
SHA-256: 8891b8a20d05b0763a7a2fc35fc5770d3f338c65640b88ff96843c6bb9d4c665
font_01_sfnt_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 18192 bytes
SHA-256: 63a7c9c9c8163ca1720a5030cb40f9f530892b0d113d193f9875507c47340923
font_02_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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