Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bd0bd1025cbda0…

MALICIOUS

PDF

76.2 KB Created: 2021-06-18 05:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4e21f974649fe6f1541424eb8c597e66 SHA-1: 540508c135fff4a2112fb578283b4e792a48be47 SHA-256: 97bd0bd1025cbda0c177937f2ae89ed77d54737e89beeea774fd866a604454a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social-engineering lure related to 'Chromecast laptop to tv setup' to trick users into installing a browser extension or update. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate credential theft or malware installation. While no scripts were directly extracted, the presence of numerous links to potentially compromised or disposable hosting sites suggests a phishing or malware distribution infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/7j9qjv8fb8k7s1u8inbfo22l2t/67472605158.pdf In PDF document text
    • https://dollarplus98.com/images/upload/files/74872006151.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad694c508a3---59985047792.pdfIn PDF document text
    • https://agatanorek.com/files/file/kegizezemubisuditeva.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/4b629a204e5b81e39f3edcb51cf25d20/wamefatogafowutukixi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/43537321954.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679d037597---xuluji.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/nikexezimatavosurobosifim.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/nipivilumogade.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8f87cf68878692e65a95b5c31d80be7c/81401375784.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3c4c134637929619b16e7a03797bc2fc/lonuretaz.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e90180c8c9282367acf5d946642a68c3/81993832216.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/26518724914.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609673eeef4bb---72497301371.pdfIn PDF document text
    • http://midel.me/userfiles/file/67120413478.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb45063a3---luwukusoturobitosomes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chromecast+laptop+to+tv+setupPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 5140 bytes
SHA-256: 6b35ae29206e8dacb2e75dd3110a4ca83f1d963efa27130fb0b5ea19079b86b4
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 12948 bytes
SHA-256: 7ce07534f26bcda23650aed74779d73739bef04a8b8b546d8c57d300ad4c5f48