Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf54e617db114bf7…

MALICIOUS

PDF

109.8 KB Created: 2021-09-02 07:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f9784434dedacd94471946d2bd647c2 SHA-1: 8d086018f28de0baf07fb6a7baedf75acaebad27 SHA-256: cf54e617db114bf72fc80065f91edf252c31145ea82c4ef4c0a383a67f5fe0c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=two+houses+of+state+legislature PDF link annotation
    • https://confidence-ist.com/ckfinder/userfiles/files/15452856023.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/13883882026.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/vuliga.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/taom08jiibenv6emvobg1k66gq/jiponija.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4db81d035a---25167974921.pdfIn PDF document text
    • http://sdes.in/uploads/vudukizijivimuku.pdfIn PDF document text
    • https://mahae.hu/files/files/pikabejetimuvugataga.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afe38b2935e---89239583154.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b44515bd30e66a22d8fa26b2aa56e9db/19912889371.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2d88dd289f4c769ff03f274b19539527/nawugiwipid.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76acc3fd73---18557041992.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/73984096236.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/46a6272b419e6ddb9fc42d30cc565c18/30187254784.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/53608777657.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/81p89tcaj2i0tr5iud3r6g9ite/68650747750.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/rinogisodivag.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d7cfc8262---22776991541.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1590e9a481---53612983116.pdfIn PDF document text
    • https://dacola.com/upload/files/76238993808.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a069036e1795cafb78b1319ef79cdb4b/xokumemuxosozi.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/jixawedodiwi.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_off00014785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14785 19272 bytes
SHA-256: fcb03c8fde592661637170f4f7aa47b31e6f6c0ffc2dd3c415aa5ca179ddcae6
font_01_sfnt_off000178f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F8 10540 bytes
SHA-256: 5e00fac50f87399b1b52579c179b16c86b1a9c46d3aaa88294c7fbc140b886d5
font_02_sfnt_off00019145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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