PDF malware analysis — malicious · f87a3764ee7dc323

MALICIOUS

PDF

76.4 KB Created: 2021-06-09 20:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-16

MD5: 136f198745918856e8a1119bdb5ad8f6 SHA-1: 6e7046fc3402b79f9e88081c21d371e8346b88c9 SHA-256: f87a3764ee7dc3230de3cad90b4579f1842f71de85bac35fb9f5dc444db0b70e

156 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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 https://krisoc.ru/uplcv?utm_term=future+tenses+upper+intermediate+exercises PDF link annotation
- http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ade3422f---81493966984.pdfIn PDF document text
- https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a23083f906---85140560692.pdfIn PDF document text
- https://plasy.com/uploads/file/filijiwizuvabasata.pdfIn PDF document text
- https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/6b5944f7ed3132994145e563159c8e0f/8836510753.pdfIn PDF document text
- https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/432a8c8d8db9906fd3d44d32a782f30e/34667974343.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898ab081e13---12520959470.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e906a518a042c13d79c234fe5700c808/jexazokenuwemozumagekurid.pdfIn PDF document text
- http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071740556f20---75126872563.pdfIn PDF document text
- http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d6aed455e---binalaz.pdfIn PDF document text
- https://eyetracking.pl/userfiles/file/zadudugewifuvarun.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/afd0c229c64ee69a045947d68f04a278/56187963901.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49ef8b656---duvabaxutupizepixulixikev.pdfIn PDF document text
- http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a892a3cf7---pavinuxafafebeg.pdfIn PDF document text
- https://prosaison.fr/userfiles/files/zaropufip.pdfIn PDF document text
- https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bf75e643c1663cf4dd641e65e2075fb/58640226084.pdfIn PDF document text
- http://aire-limpio.com/img/editor/file/17836919078.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8638578afa---83043125143.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dfa9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFA9	4984 bytes
SHA-256: `0d023e765e4b2760cfc87ffe47e5085748c384e0bf1fc0add5ee1abb227902f2`
`font_01_sfnt_off0000f076.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF076	10632 bytes
SHA-256: `148c542100cf31356df5cbfb1004e8794d1241df990981727808885a8daf29d3`
`font_02_sfnt_off000114b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114B6	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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