Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf30cae6a24a634…

MALICIOUS

PDF

81.6 KB Created: 2021-07-03 22:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6f4e16dd26749bc8f9aa85d92e38d7e3 SHA-1: 8dedad6d870707ea486daf1a40df2056d60efec1 SHA-256: ecf30cae6a24a634f8d8a3d248f285e593145e9e4ed701b40968c6d6628b7fcd
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of links, many pointing to compromised WordPress sites. The heuristic firings indicate a link farm designed to direct users to potentially malicious content, and ClamAV detection confirms its malicious nature. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=one+bedroom+townhomes PDF link annotation
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6cad878e1---xulajem.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/7327111484.pdfIn PDF document text
    • http://majesticcaliberenglishlabradors.com/clients/a/a7/a77fae3751d16767b5fd1969bdae34dd/File/56152043919.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac53948bba3---wivitixezagenezufevi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a67627ce6---zelunolufupuvedinaretut.pdfIn PDF document text
    • http://seamacros.com/upload/file/20280079675.pdfIn PDF document text
    • http://sun-tes.ru/files/file/paredifuvonotupaluso.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ab9062eea298975368c131da368cb71d/34144512472.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27e450b50---topeb.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/dorukubapovirumuwo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/89524986793.pdfIn PDF document text
    • https://brs.jo/userfiles/files/bekidovodubaw.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a962f1c9492---votuwodese.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d91ae2252cf28c0d65fa6f81e5b4d0d2/21018907905.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/xemifunetop.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096874608474---68043323268.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f0cf916995d8757c13a969eba3c4817f/39995203218.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607525f71aa9c---juwamizenolet.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/92340598850.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1cae94869d2ca386389f6f14f2356ebb/2859707757.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a130ab7cf8e---29168364423.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/tekuben.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/funetesaropabovebegowu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a32024c09df---vojanusixomoxodezupude.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21cb6105f5---buzavogavu.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/vatokekivirejizuwa.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_off0000da65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10464 bytes
SHA-256: d1d219e4da1d673d268565a2f2e0f356198dfc414b73ff2ad32214b505465241
font_02_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 17236 bytes
SHA-256: a21b4cf9dbe04b135046877faef2dffea71bca5cf7c40270ed03256ae6e6ba6d

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