Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca342f2a3e28aa4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 17:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00613725401f3f97f21773ebca6ee792 SHA-1: 58d7b21e4e37cd7d828cc79b8f0ae9d873cde7d0 SHA-256: 4ca342f2a3e28aa435fc48c0cef6cef0d28648023d1fee37fcc654d8fb6a1e81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, 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 phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://catamma.ru/uplcv?utm_term=manufacturing+processes+for+advanced+composites+campbell+pdf PDF link annotation
    • https://socohoteldanang.com/uploads/image/files/27846979295.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848b8056b3c---88705543116.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/83p4v4ta4eec1qge2nbuiq6065/44774362773.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vqe32li96fmi201kf1ftrpd721/wixexipisaretegedena.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/18471565016.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/bazuguwojof.pdfIn PDF document text
    • http://identik.hu/editor_up/tenegobubefekabok.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/forimikepatogetimuwu.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/12449299439.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/8858195534.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/89852164.pdfIn PDF document text
    • http://evola.it/userfiles/files/vexeripivatesavutezamel.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/gafasejivumebupus.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/vefewirirewetajomukog.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0f3808a4---pulisalosuluxew.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/kimulugovopokaxuxam.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/8645186363.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/89a3779ee99bd9ea30846fec66b114ec/lawobewemafizogenanev.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/59815150316.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/suxigezenetow.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/gosaxebewajebap.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160969a72ad9af---83401207947.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2137e0a34a---94195534751.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_off0000cc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC57 11260 bytes
SHA-256: 60921d5cd2047e6652a1bfd240dbc5dd9c70857d86ee8f7733345e797197502b
font_01_sfnt_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 17228 bytes
SHA-256: 40ad279a4614feb049b22d97ca730e32aa6a236404d02f91137ff48b3a6b36b2
font_02_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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