Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb597bb6bc9275c…

MALICIOUS

PDF

83.3 KB Created: 2021-06-30 10:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6fe04c01612bb2a5ccb55bd83db06dae SHA-1: 7ae3fe2458e1d8e9cc33f4547086ab52b0229e6c SHA-256: 6fb597bb6bc9275c253cec5d81146e4cbe3d1805d633eed2c9fc4e7c85d158dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://frezerovka.by/images/fxeditor/file/51505692769.pdf In PDF document text
    • http://goldnumber.info/userfiles/file/21536166724.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d776b7b65d86fc9fae5c74d2806ca562/14725061334.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/3178312407.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160878ef7a00d5---desidale.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6415e07540e6d73705e6413a3faebd39/jimumuvizofinujeteba.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ldbrm8js9ondl0i56l7kgmiovo/56290490966.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/berufosuvabalozol.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d121e4b732d942e416a70d0c6d2dcb1e/tujowif.pdfIn PDF document text
    • https://caffedisanto.it/file/13596631534.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609df37c9d66b---14365028886.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/58133307530.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/aafc0cee20e1b0813d1f61db7a20bf2e/wemezi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/musapazuvemo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/244330b0da91565adc3326775fb20b0d/15028210406.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/xifupozejunozu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6cdeeb3e8---niwifurusimugamudu.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/6091343714.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/660iv9megtlmuvrt8t263j9koe/57885610097.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/derojodivasi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a2d3064d---94247504207.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/96d36524af9d3befa4eb5a0cbcffdc75/17932779872.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa2c034c4---poboverivadedibenotawosaf.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/39729703775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=index+of+kyle+xyPDF 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_off0000e749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE749 16372 bytes
SHA-256: 934f6a44a08574a1de9721205ad53ea48bd7d7c6652467d94e6a31c44d050ac0
font_01_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 9988 bytes
SHA-256: 2e4439cf32ff64f353e0e9a2fc0cb3731b2be65e3236c6c14610b6e89bdb12d2
font_02_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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