Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a88bbf60fd4292…

MALICIOUS

PDF

91.2 KB Created: 2021-06-30 07:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b63f683d75e2d9d93555c83226cdd01 SHA-1: 59f33414263e4d6347892eaaffcca34be37aa12c SHA-256: 15a88bbf60fd42929d0f4c08168594fc001f70a8f283907f3dac52407b23a221
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db9c5527d---27479602747.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4ad75bb3---63058171247.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac380da34c7---lekoxexatetexopukenawukev.pdf
    • https://mauspro.net/upload/files/46193521239.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3ad554f86c21e12939e3875349fbe4da/kaxavikifebigefuzemuri.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8daa2f0e8---tilusotomexemabipedomo.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c556d9a3c078e23d0a4ba311c13c5bb3/befazunolekakev.pdf
    • https://anmoul.com/userfiles/file/gogalebot.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a2bd1c788---51481742215.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befaad0bb25---gamalitasepu.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b1cc494e---tegarejosubivivawumedow.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/l6953iv9u590h2ui53pgsp1cc6/zarukojamapa.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/e7qoqo5la7d1eomn02d976ri97/40425789408.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/bd1e640b14fa483d809ce39d7a636856/zesuroramusabibimeva.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a56d13beb47cb0179777362c58a8e64/tuguvunifediw.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/jevagedopawar.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bea763bda---nirapaliz.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a290f9048a7---xonapubedol.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/or2tunkncbrhu853kcmttuf1b5/fojekuzonixazor.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084f504ad573---nosefuvuxawa.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/df87eec98ebbd95e34d274407925df5a/puraverepav.pdf
    • https://tiklatakip.com/calisma2/files/uploads/xupupimataveraruk.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/taxukiliturokemafomedow.pdf
    • http://from.ua/upload/articles/2021/06/15/files/vageput.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85e2a4971b---39979320562.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=grand+canyon+skywalk+rules
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef5.bin
d1a0b1efdc4e37675fde20f1c59ae7226fe8a33d7fc547a617e4cbe44e0070e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 18208 bytes
font_01_sfnt_off00012ef2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF2 16792 bytes
font_02_sfnt_off00014709.bin
0b5a3a86bc603679c0c994c2509d131d2cf76f9d22010ae4c53d6bb64a5ee85e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14709 10604 bytes

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