Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cf611798938c99…

MALICIOUS

PDF

82.4 KB Created: 2021-09-14 22:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1957ac0baa8e7415a2cbd5247b73e372 SHA-1: 2c6ff0b7497e81cc6260c873d8d1b9d4db1bf80f SHA-256: 92cf611798938c9999f86bdfc5da8fe8163119518db7771efbbdee2e4972ed70
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier strongly indicates malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=unfortunately+the+process+android PDF link annotation
    • http://monticellotownship.org/userfiles/file/43886107207.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/doxebema.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/67079315004.pdfIn PDF document text
    • http://alptw.com/images/files/lujaxuvuxip.pdfIn PDF document text
    • http://foodchemsino.com/d/files/guzuxuzefisuvip.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/1823720982.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pegejufivilusodebegorelaz.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/91852837579.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/puvemaze.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/93655bd1bcff86a29bffcbd416567f12/devozoxe.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140758ea530a---28081658663.pdfIn PDF document text
    • http://vswet.ru/f/susojaxuv.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/69289656393.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8121c6a8---21444648030.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/2356225110.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/dalusigiwepoxusura.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb5550b68---15614136894.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6c13634a---jozakuf.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/72047678659.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/pibosudizipuf.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/serul.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/losujaxumunu.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b89b172f5---gitozukasotedezubibi.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/13439183074.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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 17896 bytes
SHA-256: f40961cab052f12cd34a3ad7148004fbc0e755668b9bac921d050cb4594b6252
font_01_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 10936 bytes
SHA-256: fe2bcfe1f4ef00c809e211f0831d1bf4bc817ab60c3dd03f3b30d84fadc369d1
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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