Malicious PDF — malware analysis report

Static analysis result for SHA-256 a510a3913c81bc86…

MALICIOUS

PDF

95.6 KB Created: 2021-06-25 22:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 81319044a354c6e222e4d16403d124a6 SHA-1: 645c2c10e315427da9a4fdf4ff3d8b9598df508a SHA-256: a510a3913c81bc8691958e3022a71514524a58c5e3b0ae4d1b8f17cf3c54d22e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a compromised CMS upload as a hosting point for some of the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://matskaren.se/anvandarbilder/203/files/favepibigosiwerutexex.pdf In PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2dncgq38amiirg26dq4huj36o4/26964349337.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/rtngrevg1nc3kfddd0aftl9tt0/sesut.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021050711122_615684438.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/fukubu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/29499406530.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/533733473b165995b92929a49b43fa13/39003225916.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fefe748e9e---64816527813.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f49a9fe60874f85430078f93420b9ea3/fanuviwuvod.pdfIn PDF document text
    • http://adveotec.com/img/file/84049230780.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a23528ecf---87439349628.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/zinur.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/edf31e7f90f751b3dc463137edd29cb1/roxusitopilajomibe.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1hvpsatv1taf74kncg46d0v8o/vunixurodupuzozofaset.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/80265663107.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3b17d2bcdf30645de02f70f6ee7cc26d/jegalizutasilazuzov.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1tae1un5e66in0a88l1f1lh9b1/misefazo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/8bmur5k5ajha35tbh3qrarivqc/gavuxiforirapubel.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/kuxafitizolopovito.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/miwejovesokemi.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4f2f837493a366a497854e977db0d839/taweguxogemigejum.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d0d78a8815de86cb89511da525f3a761/4502096954.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/16958517866.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c389eeb622ea21acb63bec564bc32776/90130020650.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cd5483a2f06b1b370f0fcb73adf84b00/gewado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=an+introduction+to+the+new+testament+pdfPDF 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_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 11004 bytes
SHA-256: ee1bf818ab67099ac36d64979de01be9b995c81334b292373743ae718378ed21
font_02_sfnt_off000143ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AB 17424 bytes
SHA-256: 202e93e5e74c17b4036126b2b781a470cbc4bda5160c29790e8639f4b6468891

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