Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2e912c6c64d988…

MALICIOUS

PDF

76.3 KB Created: 2021-07-24 06:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6bc140e186d039678ea254654035711 SHA-1: 9f64f3800302a410cc1eca63c421509d9c959cab SHA-256: ca2e912c6c64d9885f0f17ebb8464ed36b811d1ee1d5fd6a5a59b2138ec7abf9
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/418eac4dda9fc034d9b002d3af935a6a/31174149278.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfe4f3a434---50800291854.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/dujofuvofapunatoma.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/62325636893.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/d032c32ec5094098c6c525b081beb4fe/61205089772.pdfIn PDF document text
    • https://ubranni.com/uploader/files/mosisejukokij.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/80478676418.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/bde5b82ef0292c7039263783392dd981/4230075702.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/29224157052.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3a647dd8096aa64760d71ae34260b900/6312860570.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7009e2f404---vixuporasoxukavunutixazo.pdfIn PDF document text
    • https://yellowstonewildlife.com/lozoperafexipeparixemet.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/41024850795.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4643390ef334b15146a47f13de082174/72702979941.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/035f13934d7a592300262bcdb3559631/33577501151.pdfIn PDF document text
    • http://schokobrunnen.com/idata/wikefive.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/206129411667923c7261e8094abe185e/zepebuvovigomovuwadobir.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/bokumovoxelojevukifovuzi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac71345148a---66341402070.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/logaxe.pdfIn PDF document text
    • https://nadamasristorante.it/file/sovuwewipekowigana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+the+role+of+a+visionary+leaderPDF 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_off0000c94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 16264 bytes
SHA-256: 24d75d0d01c4c4a1222772feb337c705f9b89608347bf8fd7da92010826345c2
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 10624 bytes
SHA-256: 1c377f3cc78aa830f4fb919d6a33f7ca58005d8aea9d5bfcc04fa34c4d16e605
font_02_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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