Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ff89f77bf9c329…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 10:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4a8dec1123394c260058332d8ac90f25 SHA-1: f23c61c25c7ba7423a475bce7d2447ba12f9e236 SHA-256: f1ff89f77bf9c329c80464a74d60b05cdece90b37bc91a6babc94aee149d7aaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with the characteristics of a malicious document used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://catamma.ru/uplcv?utm_term=insomnia+related+to+nursing+diagnosis PDF link annotation
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/bf8972c6fee75773e7a706b10acac71f/20868940727.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609436fe66fdf---vesosesanosegafe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1c00ae3daa5bc66f6ea74ab24ef0470a/64563522763.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/40776654685.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1623244963266100762.pdfIn PDF document text
    • http://oodow.cn/upload/file/210624203403402211t55kw24bfz71.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/35645750677.pdfIn PDF document text
    • https://susta.vn/userfiles/file/tuzikojifebosasoziwenaxo.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e764bc485f---papuxuxatu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/8u3t8ekrbitkqeeh0811dj2l8m/4637828743.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/51dee16cfa36dff9b6c433c94fef6423/99636539487.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/luvexun.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6864c243d4---gupalon.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/7ss6244h9gqcndg4iosq3qtn9e/xasevojo.pdfIn PDF document text
    • http://dzbnf.com/upload/file///46075593733.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180907115844.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c40c86291e8---10196168223.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/4605195711.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16082623c81626---vuvopisazemi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/fatmnm84s457oupdguplv06u66/96407689755.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/41598d99d9bc341d99e17ea4cb71918d/vizevakulinagawu.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_off0000ec44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 16764 bytes
SHA-256: 9517c750b86a677db0f9cd0a6252e309514ad9219e0d497b67f2aaf24facbb66
font_02_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 10644 bytes
SHA-256: de5ce42ba799b018dcb645b906cf743dff0891968ccac5018076a70770ecee88

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