Malicious PDF — malware analysis report

Static analysis result for SHA-256 4816b1dea53ccf37…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 03:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 925cb48f0a3401ce29a13d32e0e78833 SHA-1: 484762e4dae4008e5f688e4aa7499bbe3ed4d2c3 SHA-256: 4816b1dea53ccf37ff9ed1bb24cd74f08dc06f391bf290623610c3f059a09c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=hydraulics+book+by+rs+khurmi+pdf PDF link annotation
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3efd30c43e81b2acc746c0963b929690/nidunukujesawubi.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/23340726899.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/81194659177.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/91335018848.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/84383279517.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/2254393888.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/59087375800.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/juxelelosafumobuzotas.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/23911893905.pdfIn PDF document text
    • https://cecprint.com/images/file/85122348803.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d298cf292ca243a4c6fcdc55aa1b61b2/85243674441.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1611340d11a4d6---78028889048.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e781a97a---96176304351.pdfIn PDF document text
    • http://ergakiland.ru/files/files/26983657735.pdfIn PDF document text
    • http://calisnt.com/uploads/files/97325899974.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/xupowovabalogirepemewokus.pdfIn PDF document text
    • http://ledson.ru/upload_picture/35451377399.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/45999667663.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f15677b5---neruzakogab.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/67318248573.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4ca156c2511c01db7e059e97ca78af52/25171924944.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/63630260001.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d01fab763a95b0409bf8eab4aaff84f6/8191960033.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/bc694eb1289230dac1c716778c52427c/zisinibib.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_off0000f010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF010 10988 bytes
SHA-256: e8a0a1e0c4af7766669465f283b3633483ebd97e7ac8e1e5a7012b2ae03f1466
font_01_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 17868 bytes
SHA-256: 2dbeda72ae2856ea11578787cfe5ebe2e07367a273f9d11996be24d08af06eba

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