Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cb8fce16a6078d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 23:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 122e4d135e355b8bc3408cbd82e34ae7 SHA-1: 128decb7cd5c7ad239a10af6f430117f36bf483e SHA-256: c3cb8fce16a6078d0024c49ef043fcaf0f6a9ac7e0e5ca5f6d45f8f05ce0b036
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection to these phishing or malicious sites, aiming to deceive the user. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://standartbio.com/fckfiles/file/72156937785.pdf In PDF document text
    • http://cordovajewelry.com/images/file/41358577910.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1611adbf68dc8f---25849445637.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ffafeba819c330a8c74e1ea9d27c3a86/93452693318.pdfIn PDF document text
    • https://denimder.org/resimler/files/85573240275.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/17192120288.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/81322186413.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/muxelogisanazan.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7174137e---10349920000.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/9357328395.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/fbba5346f51ae73301314889714e4a96/gogekitatofivaliwi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f7cj903ls761ufmpkpj4maues/11068176384.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/pejomaxorudorixupegido.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/bewoxilonititux.pdfIn PDF document text
    • http://edgecs.net/documents/28037508932.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2f690a162---84993256344.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/35977790689.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4598511b2---71958714142.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/65752874103.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/86032262985.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/323a1ebf15f76c1bac6e9a80277d0102/16740914625.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c195807ed---wijususobuwinovoduv.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/23086577353.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/meberofafemenokadudisoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=goosebumps+horrors+of+the+witch+housePDF link annotation
    • http://b2cdemo.tickets.com/content/files/43399237393.pdfIn PDF document text
    • 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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 10796 bytes
SHA-256: 9541f7f7b142990785a43d2e4cb574165e311f26c5d24c239ada46e9b0b554d8
font_02_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 18136 bytes
SHA-256: e2e74eb1fa7aef3a331243c90b8f22830a1b6107e69b3a30a3006a857d2ab0e5

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