Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf52d76e0d05e3db…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 23:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b583eb3c78cd25d9d8d39f095b5d3719 SHA-1: 5b8ebf4e143be94e800385974e3d0a369a9384b5 SHA-256: bf52d76e0d05e3db865dd79d0000def26605f81489fbec79bd4a89532f70508f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, characteristic of a link farm used to obscure the final malicious destination. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the presence of multiple suspicious URLs strongly suggests an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf16b2bb12---wabojaxariwa.pdf In PDF document text
    • http://webursitet.org/Files/file/32257073826.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a546d3c34---50667580494.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/31910506696.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/5ec1cf455c7c389cc47f3cdd708ef3d9/52762599699.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/77011751443.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ngc01aaudkcabcrop2ec0v813g/18720353109.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982eb779853---ronapojafojiw.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/fejodazagimaxunotiweg.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b050d053b8c---2366883181.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/jebogiwisipipoxo.pdfIn PDF document text
    • http://omg.su/upload/File/64618974005.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rifivugagapuwo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3a182b910---87049746435.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/62011053243.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/019ce097ba5320eba282c804945e5459/98381819824.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/gujoxezagorivinasosisus.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/zuxaburud.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/saredof.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd09f0990d---74273326064.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/3da46d0a68505ec209aba658f907e347/ditijosurikutoj.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/2b4a8c2b46eac26a30deccc65d9b114b/mupikiwejetibuvora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=all+medical+terms+have+at+least+onePDF 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_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 10680 bytes
SHA-256: aaa4e31648a749485c2420fcae96bfce0616ddfd2c43810c63c19ec9d8658082
font_02_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 17572 bytes
SHA-256: 3106c51d1243572365c506b27c10498d27b34687a013f1c933654fd19a49e2ca

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