Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cd2dc236658205…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 23:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 72a76a103962c5eb479f6eada46f467e SHA-1: e39485b2681d48660e8209aacad3cca3cad4a1e1 SHA-256: 66cd2dc236658205d26d652e8f0e58604e3da39e8c11b206e2f914cfe200a69c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://108pizza.pl/uploads/userfiles/files/24137753936.pdf In PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3430d73ffd05f54050677f0eecaa330c/82107704325.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/58145990807.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/70903818848.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/fqem8rq58labijgmmevpf1bmj6/xevivenokewepuri.pdfIn PDF document text
    • http://panova-art.com/files/file/pigerowekerupipobojujar.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/vepedososalaxebuwogagogos.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/17695243074.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/62729815110.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/kitemogisekavuxodidomafiw.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/jowapowolofivi.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/87016726503.pdfIn PDF document text
    • http://njchemland.com/upload/files/64051846407.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/judogadilupenekobug.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d308c981aa08297eb86007dc930ac9e8/rawixifinavanewujevuka.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/95920475625.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/83129011838.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/38328973832.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/49502167409.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/genorapewaj.pdfIn PDF document text
    • http://zevkotodoseme.com/upload/ckfinder/files/bilevabotemib.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a1da92b36f7b6b0443e4e10738a275ba/wasimomejojimorawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=infectious+diseases+textbook+pdf+free+downloadPDF 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_off0000b11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11F 14920 bytes
SHA-256: 352f01e6f671fbc26e9713c4217e5bf7d6ddd56f58ac59cd52afe4592b6986a5
font_01_sfnt_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 11084 bytes
SHA-256: 5f09e36d2ce14f7d9fb6ab9da82f009f437355e7a108d6345a54014643943f91
font_02_sfnt_off0000f084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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