Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef04c29930f2f51…

MALICIOUS

PDF

93.1 KB Created: 2021-07-02 13:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd4dfdda07f382c268b890dcf8521fc5 SHA-1: d10274a6dc54775477d90d18ff095e87fafc936f SHA-256: 6ef04c29930f2f517e454415e4a4f21f16230109e5145d80cd03c4b7f720567f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d8d282df0---nuguja.pdf In PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160824910d64f6---lovutagopilovunu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bca85bd5---61555836252.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/e0nt65epehupou2t18omp7it54/riminutonipopakodixese.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a359463bc53---disulonenun.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4bb7d7d86---14925999312.pdfIn PDF document text
    • http://veribase.com/E/file/32431532080.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/c6hrm778bdn3jln2r74qrbots6/gisirutofemil.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/pesuxeji.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/76825875944.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a45dfa116e3b0705b07723da0a6609ae/30186418386.pdfIn PDF document text
    • http://mebco.ru/images/file/weputepapebotuvenorubewep.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/91471502209.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4853dac1fa0a2a2255132abc56968b1a/dotujudububaf.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1df81b80e---55788962775.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b9f0e316948aa6969c2dcac75bf03317/51810572610.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e0138bb23f586969f7b9e5ddf3364442/voxipuvubukikoseku.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/27f0677d4b618b1fa143c70d5f6dc5f3/pusetazaliwanemubo.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/97129617637.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/hu1pfp9gvb6fevrtmhu88gcb9p/91399578883.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/pi7o9tfrj3vc6h3agglnf2p26m/xasepupupogaka.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160893582abe8a---vomisejafinidikegozov.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/724a496fd26e5b1b5d5178be286c9d81/limorolawemirawujobive.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1f2f2010009419c0a7b355252a18fb20/japuzuvif.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3436a7b5c50bb27b400d5ffa437cbf59/88027471799.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0631b6e1eff34d3a74a276b70ffd4158/44105782181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fork+of+a+tree+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10412 bytes
SHA-256: cfbc57e3d61ade3e5aa460f822d8362b4f334762dc8f4c5351353ad8fabb8c96
font_01_sfnt_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 17704 bytes
SHA-256: 5b4fb0fc808f658e65ceeb880dbad9e20c5dd56d7687790e628c3589826ceb3b
font_03_sfnt_off00015cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDF 2092 bytes
SHA-256: 4e726621618450a1a8e6e95146ab7445e71366e16ea1aaf62970fdc8c5189e04

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