Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf0dff82b8e179f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 14:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10a5339ffbf119ecb658370f81f7e1e1 SHA-1: bbd61f57b559320fa3e9ebc8d9056f4f19d159c7 SHA-256: 3cf0dff82b8e179f79d9641d2844cb0f07fee9024f817a6eebc16ab54d247ef0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=kriya+yoga+pdf+drive PDF link annotation
    • http://umiyawoodworks.com/fckdb/userfiles/file/ruwovuwolopovepusu.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/xobigexerufuvenakavu.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/bijuwofuxorudavabusajal.pdfIn PDF document text
    • http://juentai.com/userfiles/files/21167855057.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/87311774387.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/suwiguxo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tmcqahmqla447fa6dd4csrjn52/99528153190.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/16829883433.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b52602bb7e7---banepupeniwulejotesazugep.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/92992461899.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fda0df298a6---70851731672.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/29040340063.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160790d9ed49ea---xerafavufona.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebfafa49db---wolemiko.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/vepanow.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/16922786336.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/mefepow.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102eb4155aca---dejorabug.pdfIn PDF document text
    • http://web68s.com/upload/files/zakovuluvakubosibosotegep.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a464bbd00fa---89156357815.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/92712530025.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/vabiwunodagar.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/76685880306.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/49683546386.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/85842337176.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9ca95f6cacc549da626b9bfde9279753/62352173327.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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 18792 bytes
SHA-256: 394e658160b96fe60aa93109da4a7a67f951470fafeeb2b48f5b9a371ecd053e
font_01_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 10428 bytes
SHA-256: 9a0170ab95ea0b6baa7e359909ad76f2fe8a7893ed6a5d8f0af5b9e0c419d836

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