Malicious PDF — malware analysis report

Static analysis result for SHA-256 762b6dd4290ca2c0…

MALICIOUS

PDF

87.0 KB Created: 2021-08-07 19:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 285633ab725f0b7768022444d353a23a SHA-1: 4f2b97a071579f220ce8d36a055b37243018ca46 SHA-256: 762b6dd4290ca2c0be282d3d7693eb8886512282563b9b16a6cd6fe0bcba0803
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • 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 http://dansensvenner.dk/imagesfile///87991314306.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3714f36c220d7d9451fd753557e1812c/86828250660.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883195ed1c0---rizufuzajejilukalajagabi.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160743d8db5d34---pusenovigenanobur.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/vijutelejuxu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4a7c9a2c3d20b6c9249902fbe2af8308/majitaw.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/70124876460d03febe38d2.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/26407612900.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/69e7ead967d514ad24aefb863a1af318/17892303663.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mhj0b1lc0mo2vt040bfmd6fu17/jadarodujopodopogemuxosas.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a756de75411---63811649937.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2c4df930---kefomito.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/83848531786.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/kiwetawawe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f046c66944---mewewibevinorelinorenepe.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609461ec6b03b---siranowifit.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nul80g9l7df9tm85dliado8js2/12380524332.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb276c53fe6---9461517412.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/sm012o91b58n7uohtqcefq6an3/26748086026.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210519120307524198o5baio.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/59hs0jtdisfiobuvch8qb3nu46/medimawut.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e9e0f0cb---nusilaxorogutosipur.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/xozejivotoletozetisifal.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4af6fb17848d6e5bbcc40a98885831f5/xekoxomo.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/nogubuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=thou+shalt+not+diePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 10308 bytes
SHA-256: b787377b55e539054038c0471e50d5e0b9463c964a0d3a94e3e96e763c027efc
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 2768 bytes
SHA-256: 8a18e32c5b3f0ca141d20759e83dc9d4589158f674680847672a930b44d0f2f6
font_02_sfnt_off0001061e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E30 18436 bytes
SHA-256: 5ffacc5d88289c590e10ae6c358f5528e1cf4424f3c14c21efb0ff722e624956

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