Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d446bf8eed59e0…

MALICIOUS

PDF

84.0 KB Created: 2021-10-07 11:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 552366ee54152c3193d77d99bff91b43 SHA-1: cf42b344483308d185da1d970fa94b7147ba71f2 SHA-256: 34d446bf8eed59e03d89d51c40ad27c5d66ff1640c25f7108803827f7539b2df
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. It functions as a link farm, containing numerous URLs pointing to compromised websites, some of which are hosted on disposable domains or use UTM parameters for tracking. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=incentre+of+a+triangle+formula+proof PDF link annotation
    • http://studiozoppini.com/userfiles/files/xukolasipowurawulojem.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614386d241cc2---dowozolaz.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/22265580798.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613e565546267---84315531214.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/79491964207.pdfIn PDF document text
    • http://orlickachata.cz/files/files/84439468094.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/sibefuxawolikakalosip.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///15280934643.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/kivonuxododoributeki.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/16525954038.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/puveluxasir.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/jixidojoxexeke.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/23236746998.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sd4tfmhannuu9tnh7trfk3huup/28070183868.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/68861131414.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/81146188142.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/26668238770.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84713135705.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/katufeguj.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/45965148341.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cfad65q62bddsj6a9lfil22974/54275710758.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/57669899466.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472d8d1c790---wepovima.pdfIn PDF document text
    • 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 10704 bytes
SHA-256: c1f4a8334dd3552216e0784e68d0f5a1769655547950275c63bd03010d868aa9
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 20352 bytes
SHA-256: 70bbffe62de3a79db8790cb2f1b4fb591b7f345fdab9ca2bbba83e37d02ff2bd

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