Malicious PDF — malware analysis report

Static analysis result for SHA-256 73af038f29a4bcd4…

MALICIOUS

PDF

85.4 KB Created: 2021-07-04 07:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 96aacdda9eba5966ecc9cbb90d0ad8da SHA-1: 16037ed39d9d6c40b0206c88747aa1e815a2bea2 SHA-256: 73af038f29a4bcd4df49e1acbdd88132a38e8fd6f9e7fdb379ae9e1acac5fdce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b3dde0075---46230228554.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gi576cuso5dc4fmlmtnkjrht6v/forolulotivu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1b40a9e2d9ba605c0d31e1cd3c601ea0/34711989632.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8ldq5ul0tdu81tnunub9eq85p0/62763157948.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/19461323625.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/naduzaleneriwawufojakaw.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a7c4797a936509edf94507d358a736ba/78433817419.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c22582e7674---8791946924.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718c3217ba9---debamajo.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fjk40jb00phm1prmr14n5k08o8/laponopaferosagi.pdfIn PDF document text
    • http://short-story.ru/upload/file/waremaxilazixomonus.pdfIn PDF document text
    • http://cityfate.com/files/files/22572829467.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/mufajepelaz.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/lutek.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9893a23dd14e1d415d8393f26d2285ff/xexuladazapodikap.pdfIn PDF document text
    • http://adveotec.com/img/file/ledimabamisidadeda.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qa2tj2391bik30ocll1s1fk5s2/81256156506.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/62ae1c02d65b2cff2814bbfdf457367b/nusagorakonagemejaku.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6931311e---17973916437.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/11154686221.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/zotolariwe.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a5269cb6---6546246919.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88ffd0d47---vuvuzigasupinaxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+make+armour+stand+minecraftPDF 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_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 17808 bytes
SHA-256: e56706ec69e3aff65574248a246c907bf17f8c4a0cd18f136519abc9c950701c
font_01_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 10860 bytes
SHA-256: da431ee696731fedd25dd177ade2e9d66221844431d2bbf1498a422a103cbd9e

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