Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d3bed7ffa8b910…

MALICIOUS

PDF

89.2 KB Created: 2021-06-28 20:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 73891d82caacbd133410e40a99f0da26 SHA-1: 6c5a1381179fd396ac2e43dde678017cc220078e SHA-256: b4d3bed7ffa8b910f203ec4a1eff66d7dc91a1a254f87365f115ca8a28e00648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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 https://archism.ru/uplcv?utm_term=keflex+500mg+for+urinary+tract+infection PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8d1a6aead3af4337a9892f7d84bc59f2/radakunajugadagiduletoxo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737c0227bc9---ziwip.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/363kaaokft9olvag6ecd0srjls/70398200041.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b40c2c8740109ca97b79b1e53ed185b5/jugegagivowozemazaxo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a219cc6271---siwowinelum.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94ba03541f---fapapifawagutosepodo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b23c5de9e5---pesuzawazulagavutetor.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7b6ce1be---79522039175.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/faxuxefom.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b901e60ea0---ropegelij.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pqvv02cm04cdest91627sucjq7/89375283979.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160989abb21344---bujapanivofa.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160781fd01c713---72266638015.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/5bit59hjbt5jgf9ll648fkd526/81027996630.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e57163883fdde5f44dfca93e1e063be3/getevukadabemujibofem.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a3de4111b5821d1eb024fa9af25f346c/75991110710.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dkjqa2gjqjjovc7r2lece17aef/89121600943.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/aj68rmi6bqpsvr3rvf0d1lgebm/4371713650.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d6d0b5433---46194442684.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/76827318788.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ddd60f46ccee8f9adb3d1df445536a8/81971955695.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/72769ecb0f99a83faf5c5834cc4242d0/99169591646.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bba24540365---33942727292.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/dibisufugaberexisik.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa80b2f754---dagekileniv.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_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 11076 bytes
SHA-256: 0ba710e14b301895363734bbeccc55a125290decc070bf9443baa12ee44e536e
font_01_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 16700 bytes
SHA-256: 3b4555249ec6d8b5499a9ba840aac012a6701cdfe424ff2182cc232d6248322f
font_02_sfnt_off00013f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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