Malicious PDF — malware analysis report

Static analysis result for SHA-256 f391bc3558b87c5a…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 10:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: af7a07cc3309059c2856cab7369d0d60 SHA-1: b0373ac5bd91e0531d87b4ba929aeb160f612ce6 SHA-256: f391bc3558b87c5a443d91b378d74821f8821c8aa5d8c4fa6fbdf396c521cb1e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO poisoning attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary goal appears to be directing users to potentially malicious or deceptive content through these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://bajajsports.com/userfiles/file/30490864519.pdf In PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/99500624172.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/punewu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9649d4b2cc---rapotudasavewodidomozuma.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d37015c4d57ec547b66483c3e4165e4c/giwaf.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b482af8715edf10259415a36269b69b6/petavob.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/genofivamuporujedo.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/384a2bb9172ae3aa00e6793c00e5b90a/vibabasasiwukidevekugez.pdfIn PDF document text
    • https://codecs.roimages/file/92353499415.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/jokagutodewaza.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096c9e17961d---vujukefur.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/vidozowelu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b99ace0e27---sagositi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/pavonojutiridokake.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/kotus.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/wojoto.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/469241119ed1c038f982c1b399694a6f/36714659214.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/eeb84167efff55ed1ab77fe6821d9b97/50792936213.pdfIn PDF document text
    • http://heureka-cz.eu/files/rufekaxiwam.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/kefexujunexined.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/gufojepiriwoxemax.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dubemefexu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04720585a9---letovulibijubejajatajelu.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/bowiseberokozujolis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=office+cleaning+companies+near+mePDF 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_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 10752 bytes
SHA-256: afa723c5c4347243cc9b75ea549498a6c0788a26ddfbd3d5a9f42c04528e4f91
font_02_sfnt_off00012898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12898 17376 bytes
SHA-256: adff30a472193cf9345623563b2012cdb5c7d868ce505a37975ee1aa0f7cdd8a