Malicious PDF — malware analysis report

Static analysis result for SHA-256 b736a6b4c307bbdb…

MALICIOUS

PDF

81.3 KB Created: 2021-07-07 15:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: fb7fe29332f448db731b189f2db61d74 SHA-1: f32fd1d776aff8eb1ab2d19f49d2ace6e7f3b013 SHA-256: b736a6b4c307bbdba18ca5807c93aeb450f6255928f4b501ac2353adf566cdd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other potentially malicious PDF files. These links likely serve to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crewmak.ru/uplcv?utm_term=may+2010+ca+final+suggested+answers PDF link annotation
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/819eab3ef1a0cfd73b474ea1115d8ba8/90815236231.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210616_110216.pdfIn PDF document text
    • http://93564497.com/userfiles/10834001741.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/7a9c6075034696deb13616e3c7fae246/20672428061.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/ziwizudekukezidalobaraba.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c6add504---datasatosapigute.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/73b032737aff454e6e1b3cf37585957f/28172779939.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c887182ac9---zuzofo.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/rukadirabakowixozozixus.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d1c7678919b3ca66675dfa235b4162b/25411913601.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba162bd5f---jobegokurewarif.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081657e1d8ff---razotirametelugela.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/c2lo1ak17topeks8362ni9norr/23901431350.pdfIn PDF document text
    • http://kaies.cn/upfiles/210525011213649782exynon.pdfIn PDF document text
    • http://olympusflights.com/files/files/vuzemujes.pdfIn PDF document text
    • https://fishuntpesca.it/file/5457752622.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/4686401519.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608706f8e9ae2---47339274156.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/be9e41aa65bf59db7f234ccafdfa2a93/67809041448.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/57685ed84643c8b10b7c086e8dc041a2/duvojizowapebojifuneriweb.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/76988769127.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/fovuwuxezaxej.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c512ccc82b3---firamudegijepulexarofope.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/sivedopofu.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_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 17136 bytes
SHA-256: 2a4d34a20707769fa44d1081692831ab7a506ce1efbc01635e272ee65e4181af
font_02_sfnt_off00011e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8E 11116 bytes
SHA-256: 26ebab6d85c2d10dd9e875c032b592187eefd36b7a66f3fbce066b1cd7cd096f

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