Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca8de07c891909f…

MALICIOUS

PDF

90.2 KB Created: 2021-07-08 12:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c1e3818f30e78468e04faa033bc41a55 SHA-1: dd7d64fac346450ded2fa681b392f3d3416a92ee SHA-256: eca8de07c891909f1704fdaf6685ce39a13ab0e4d6eb4a1d5feff384eaf36212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs and links to websites, some of which are hosted on compromised WordPress upload storage, suggesting it functions as a link farm. The presence of embedded URLs and the nature of the links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://chcial.ru/uplcv?utm_term=baby+driver+full+movie+watch+free PDF link annotation
    • https://on-call-anatomist.org/ckfinder/userfiles/files/86609666155.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/sexoron.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf712e4e16---zofirifuworeseg.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/bugakiviwudidison.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/r7l8np3tblvbaakjlsgul6eeat/nudetalarusizobog.pdfIn PDF document text
    • https://bataretak.com/img/files/file/jijixipijodamikemulal.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/vidigufuj.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/xezekimumo.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078f050ca219---xolutanavipunakumifewis.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/14891304845.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ad3178f04---59848584348.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/6865313924.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa5b2254a---tosupobufadob.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc6c0a1f9c---lakuli.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a62730cf45---3156689099.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f4dce22f---69012386749.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/27392392967.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/xavinilin.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/mewawakijevewewuwanite.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/7064462dc11d6c8217629b44376ec1a9/bufuxukedirofufexevode.pdfIn PDF document text
    • https://nevisnews.com/userfiles/dajaxaselowe.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160762b3f4b450---jinolulajiroredurupikizi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc9ea7a992---33441137959.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/namipitupomumotobitad.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/gofisunevigokev.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_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 17080 bytes
SHA-256: 3f3aa6604e7c7939ca9ffd368039b8724bc22ad7167d168cc807208a37471e70
font_02_sfnt_off000141bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BF 11028 bytes
SHA-256: 4bb53452487dc9ec2eab5e111008040d6275cecb23464baa35000ce8d11104a3

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