Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d66209f45fbb89…

MALICIOUS

PDF

76.0 KB Created: 2021-07-01 23:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac42133097180efefe22fb3452093afb SHA-1: 3c4f93877913c87260be0a26ea7544553ae286bf SHA-256: 37d66209f45fbb89aa36f81656914ddf885ba3539bf49b8f3375d792369fc628
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6804e0ef6---9322004054.pdf In PDF document text
    • https://sensorservice.org/userfiles/file/jagiwutufegidegaxi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/binafo.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/newat.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/bopiduvozegonirive.pdfIn PDF document text
    • http://farmina.ru/uploads/files/28278884121.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d88ef4baa3959a70d269326fac2a7068/pikatonelukuwokolisuwimo.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kenafowobopegibogib.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/rubiduwemexiwenosi.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/taxako.pdfIn PDF document text
    • https://windsbs.biz/files/file/60721549231.pdfIn PDF document text
    • http://canvangdientu.com/images/file/38672443946.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/jovadijirupaxedudovibotap.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2d0df244d53c203c0e77a45940f5a2fc/ninaxufunimotuxagotav.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e45054cb360c419339abbb98f746deb0/nurodowesesiki.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/t5tu6d9jpg6g0ermdh5ldeh4cn/80613860747.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c2c8627c2---96116822554.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/33c7df4f80e840faebca66369480b6b6/fanevenaworepaporo.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mtb5iv7orbg4f279km7jln297l/wefijuxewiru.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/uli995sactcr2cp2p8u8jroei7/xorotiforivatufol.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/dab141fb225d754f588b13da8719767d/95598160387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=html+multiline+textboxPDF 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_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 17824 bytes
SHA-256: 8e41e3e00cb3066a766550d0294ec974b2fa8ead6c6fdeab895f9299461c9eda
font_02_sfnt_off00010ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA2 10172 bytes
SHA-256: 3f6dcd0ab2f236b38d29e095e7c05cdfd3373ce4c2d34581d1b8b35ec5c1798c

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