Malicious PDF — malware analysis report

Static analysis result for SHA-256 3954bc2a42b5ccfd…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 18:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8c3ed77d9515f19067e6a25e77929e0 SHA-1: 208ff59d5b581e6fb9d63244e5db6b355ebb597d SHA-256: 3954bc2a42b5ccfd8e94ac4ae9124d384ec9ec685269b159f78d1ef25874f6a6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it is designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thokhoavietnam.com/upload/files/nujazefug.pdf In PDF document text
    • http://cesurmakina.com/userfiles/file/mosivatapozebenaroduvo.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7dcfc739eb7f850c39e854d927ffeff2/85134127914.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/lalurimesow.pdfIn PDF document text
    • http://delve-cr.com/uploads/67349622215.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3103679f1c0c4fd70326808c53bdd71f/tulav.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/59606528434.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/basoferapelobil.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/xupafiforuwokubi.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/vawekutomejanokenaj.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/29276495732.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/xibejiwamogikopogalabi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613993dad9c72---pefebolinukezefovus.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93577bb0f---xibokuzakugamagojazoxoda.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/pepaj.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210907091249_94564800.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/lanujep.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/1606884938.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/49389125053.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/pefema.pdfIn PDF document text
    • http://hevolta.com/upload/file/wijowukomajawef.pdfIn PDF document text
    • https://shunnasato.com/lokanizebaresomulotata.pdfIn PDF document text
    • http://c-amc.com/upload/files/jideveto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fandry+full+movie+download+1080pPDF 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_off0000e6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 17500 bytes
SHA-256: 5a5daef36167a0a0e14dac3140fb56a6f79655137755edb3f14874aafb6df985
font_02_sfnt_off00012c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C25 11116 bytes
SHA-256: d2dc4a0a755a59e13e3e2f7de725ece4b58d77bfec2047ef0d944ccfc3d380ee

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