Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc2d1262d90db36…

MALICIOUS

PDF

92.3 KB Created: 2021-08-13 23:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 482e7d5f970f17f66d4dd39d69ec8096 SHA-1: 67ea264f9ada2a163972e3666731a422eae4e74a SHA-256: bdc2d1262d90db363ed88896785c93d6b9802fb74f495cb6fa2bfc76ace28797
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as phishing or a trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://wastran.ru/uplcv?utm_term=essentials+of+materials+science+and+engineering+3rd+edition+pdf+download PDF link annotation
    • https://verandapattaya.com/userfiles/files/40090404829.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/zabaretelinezif.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f266390275f---48824335341.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b93ab63da---10397122054.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bf46062bc27dc8296a3ea2e0d6aa1417/jodimogogulup.pdfIn PDF document text
    • http://uniqsofttech.com/userfiles/file///nudamivulidezaxav.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/21544798204.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/dalefova.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/01818f5597a8521d0830b18d6d3cd422/75518007890.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/4ott1c1qg2jmo8ej5veh7fpgi0/43382067132.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/fa1d77ee926c5df13efaf369da2f6993/27161860276.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210519094828.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/lamopapupisusaxe.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/ledelotud.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bb0d092f01d72b32e8843e3578ce72e8/jemagoge.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/22013557023.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16085f010cd759---kozole.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/719569a92d06807a81d5db77d14411e8/85508119055.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d7990c2d5ee8e8c64a8f6120d2600ad7/16689725477.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/77657787375.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/62110441491.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_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 11204 bytes
SHA-256: e20320593d595f4416d289fe998de753b7dd760b2e0a6f73919c91c999e2bb05
font_02_sfnt_off0001358d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358D 17540 bytes
SHA-256: 68224630085be37f1dfe4ebc88166bc7bbffce927d7cfce0379fc3fb95eff917

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