Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7429bd73531ace6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 08:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 251802dd7c5379c72177424bb484949a SHA-1: 60249d2d8948e73ecc219a4401ffdd4be0db5857 SHA-256: b7429bd73531ace642abc61989b9b2c36b509c6fd684b83dbc4afc3b2b6c0455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=extech+instruments+mini+thermo+anemometer+45118+manual PDF link annotation
    • http://maychamsocda.vn/images/userfiles/file/9882656383.pdfIn PDF document text
    • http://termocity.by/pics/files/14413392650.pdfIn PDF document text
    • https://people11people.gr/uploads/File/gufidolanerisiman.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/85623784650.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d1788e35e---23138541929.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/22107771513.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/83564820966.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/45625715651.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/gupifikojenuverubikon.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d81344bde142d7492e576bb4a0c2b6a5/nulagonazaxuzidu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d7cc3ce58---34326832776.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/tisodepelujokozu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd7140e45---88295456804.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/dexazakug.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7b6f3bdbff08a9950ff6cc066f8c72f5/mukaw.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666f04dde5---4720797548.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a95d6f6d5b4165d1ce3069b53fc92e85/jubefufozaputotafulume.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/77926171471.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/75067869585.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/48226352973.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jh6gatu117c4lcaqh7j50p6u76/filumibosogumesepe.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_off0000c8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B3 20676 bytes
SHA-256: c0f62e011cfd9225d35b6d1737eb485fa7d30b76badae2acdff08c0e113ab377
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 11152 bytes
SHA-256: 94a9b0a8f36dd045066d9fdb7dc9cad382705d3bf3d3bc13904d4e8c417f4b46
font_02_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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