Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20021964b4e4099…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 22:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebf1b926947c844728a8d305bd416481 SHA-1: c7ffc3922db1e3cdedf82d3304cc719da618ceee SHA-256: b20021964b4e40993f56a817b98a671cbc5ad4590464ca2c60aaaaf8bd9a4b84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://hastensandbreakfast.nl/userfiles/file/faxovuxasawabatesakik.pdf In PDF document text
    • http://otoform.com/upload/ckfinder/files/fikizavomitosagu.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/41769581206.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/27964c53d1efc7260d43507914bbf6b0/mavelarulitulagaw.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/98542935795.pdfIn PDF document text
    • http://rayer.cn/d/files/podawunowi.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/73781880877.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/5737069508.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/sivigusisifi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b037d1d3bd---45463555194.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/bebexufikijugasatawosop.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/xokixudibejusigu.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/77598130858.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/dozemigen.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/wifesororiminajake.pdfIn PDF document text
    • http://imi.vc/upload/files/45181017180.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97710054536.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/jevozidunu.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/lubirudebuzovusobobuf.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4cbe4c6dcca56a7ea0283036b8b72f32/20154717519.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/88902592579.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/somad.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/77845510516.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/badaganalefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+install+playstore+in+genymotionPDF 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_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 18124 bytes
SHA-256: 14aec8d68a4c336ca484c5b2dbc6710420fb816f3190bdd153597feb602f1d55
font_01_sfnt_off00010d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 10784 bytes
SHA-256: 71d3ac58b25d1259810159810081fa1c92130858a770a838a750d8c50e285ce6
font_02_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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