Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b6639fb7e24cb9…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 09:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 426d63e59f5e0495f64432f92d8dc188 SHA-1: 49213de88ee4d803f7ab52679fb55f93b573c662 SHA-256: a8b6639fb7e24cb9975159908f4d10949c3ee43cad1572730b441a23f713af96
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute malicious content or redirect users to phishing sites. The presence of numerous unknown URLs further supports its role as a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afac46c9be2---45281817876.pdf In PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b967136008---remudaxovurogafi.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4bcc960f8---79200075759.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/89979030945.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160951d986c4a7---24793187645.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/podezetixemuwamazebemewok.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/56f2780dc5babb85c3833e2ee90dd3a2/xomasudatelutozug.pdfIn PDF document text
    • http://amdind.com/userfiles/file/61269625930.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d35748c92b1f32795093b77bf2c75058/bukixamomufuleveg.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/92c87fcb0cbd62e8987b23e2618875a5/95422868850.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d048b4087e50a967f3c87ed46c1b7b00/54518653939.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0b88a4f03936e8afa0c7206bd57b4d6d/wolibogoxofasabofib.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c55473b8d48d1459b5ffeec86155797d/fimojatarizafukegobow.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/4156280401.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/caee5d9a206edee083250c415a00b863/gepajepeniwizoka.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/80826725583.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2b23ba7bc---58030117637.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/6aee242e39cba807ce66e28885f3a2bf/6422632229.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/mamejowodita.pdfIn PDF document text
    • http://mobilenmr.com/files/files/86449158114.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094deb02b5b0---61098959467.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/1b58f1daa3e3d0473ef09446b6b882de/49384424068.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aabca6077---jufeviroje.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/kaxavakope.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=qualitative+methods+in+psychologyPDF 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_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 16296 bytes
SHA-256: 5a279ca688983c32c809975861ee72f815588e6fadf345360e09a703aed53ad6
font_01_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 11200 bytes
SHA-256: 8121edb3bc4ddca4928f180d389765b9d0241e478e423a032b7ecfa5fdb9bc9f
font_02_sfnt_off00012def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1