Malicious PDF — malware analysis report

Static analysis result for SHA-256 58294cbb29a079a0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 01:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5485376262134bd2caf14d6920036b3e SHA-1: 1560a129032d54843636443717f539de5c02225a SHA-256: 58294cbb29a079a0b387dfd8cac0e6b70d889b0074d66c5a421043be1e033274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's intended to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.enredmail.com/templates/files/idCliente_/file/57883442393.pdf In PDF document text
    • https://greenfins-thailand.org/uploads/file/34526588748.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/xiwajujefotukemusoxuz.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/14139307260.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346edbc3e4---ligiz.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/pativ.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a88a48662---88668627563.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/mimerowisorasoziwogegi.pdfIn PDF document text
    • http://matras-devison.com/upload/file/kezik.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/vekulivuwu.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ruwipufipabimusigukumonil.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/vawixojudelojaxogapom.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/sonodezowovujozutozo.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/79036278784.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/37490588814.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/saguravarobuzuzi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c46dfb9345eed5034721b008fdfda41b/lobosifusiwexofegelajofum.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/lakopuvekes.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/kimosifojomewizaxusozud.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/72881814007.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/7899336932.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b801872033cc447dd648b4c0071e0d8b/30627790837.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf303e8fe9---logefupuned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=delete+cache+memory+androidPDF 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_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 17780 bytes
SHA-256: dea81e147be3545ca1e241b6b0cf0b78bb85c8441a47aa7d937afb75c28764c9
font_01_sfnt_off0001139b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 10584 bytes
SHA-256: 9c8f4673d8eb1bfe35ea366da16e81d43816cf558ad73adef4275a48b58112d4