Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d39114a6f7984c…

MALICIOUS

PDF

112.1 KB Created: 2021-06-30 09:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df2c37df9d1b2ec9adfba2adef3b85ad SHA-1: 94a0c286c67ba68094cd757ff557c18a8e656271 SHA-256: 89d39114a6f7984c54328c0ca6b9ef9e64a8d0b5f11debc5bdc1da61e0877ede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088b792536c1---denoroxemufajegorele.pdf In PDF document text
    • https://electroagro.es/pub/files/pazegevaja.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/zadawalorivezefuno.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/xosunu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5248d6c2---18190262706.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/4ad325dd83ce1e8a329206c94a79d193/koxosonepu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe30891b7---76047043399.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3c89cb4e8---nesusarepodedidojipafoxu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088577e8da7e---74772273209.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c178b288d9e---60994307732.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n2mksq8e825n1gknfvdql6b23i/zufexo.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b5d0edcab449c24d05da987ad530bff0/50615630402.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/71f0d38d703ae5c415893ffbeae58477/56639144825.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/eerbuhkhgsltlgi19h8cv38nkf/53488625351.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/10056183081.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a857f180270---gigukuvulanag.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71371272d---xizejezitufirofevuzu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160867bc6596d4---taxuwedusipejibuwokeju.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/vumiri.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088cca7cccb9---69642836911.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/jeregavipawaladebexiwa.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3aa09ea9c19bf4a587ea890d742897b5/73829983842.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/42032470876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=conserve+nature+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://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_off00015c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000174b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B1 16460 bytes
SHA-256: 4d97c425b1d3850781836c1b2f617ddc43e9d8c2ed2f757d00c70314267777c2
font_02_sfnt_off00019f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F4E 10600 bytes
SHA-256: 97141d258d4e44c6678dd2fc692fdecc8f0d9eb6fc898e5fc178e66565eb3821

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