Malicious PDF — malware analysis report

Static analysis result for SHA-256 2495ac24e5873a68…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 20:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 191d6a981dc4d124ea38382d9084f55b SHA-1: d3096630f742ee100fafbb1aae41b368e9d08700 SHA-256: 2495ac24e5873a68a888d05eee61d7ee45d33c317ed40f087eea8316dd79fbc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=purpose+of+planning+in+an+organization
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2fad2f51b---39658502211.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a866a7034---botilesixivomipewa.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/be0c97f51d772ba614709c0eb3d26b5a/jeravatewe.pdf
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/94761108110.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/952911251.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/776adddb2fc92ce85d6ddf1dd5724dce/tumitewaririrewuvero.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4c053bc1c310e2c881c4eaf68a9dd249/67718229586.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/2uu0k0n7d8bpu4ccq8ugtv1be2/60969330715.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/df2d2fb13c2132a3ca8e03d5abda8719/10655461993.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/7fae4a7faafd9ee5b2d641c8dc6dbc97/lesatovaw.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076b292832dc---pelomupafem.pdf
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/dodaxaxevekud.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/91176373914.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a9b8e908---gasupo.pdf
    • https://llsindia.in/FCKeditor/file/42580330046.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607908e23515e---dofenegixopudapepo.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/39b00e7fc827777656cec68dac6eeee9/9802022276.pdf
    • http://eltonltd.ru/sites/default/files/uploads/mipurin.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/bd9bc72b9bbd96aec868705fb589c77d/51878401887.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/44b98c7a25b4f0ae37741db25ee920a7/71082930953.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/e36a66cce52b3e5a0569575d94847a4d/68682191061.pdf
    • http://portalcom-b2b.es/img/user///file/_0298201001620169175.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/515cc3e391b2db3591f0e2cb844c2323/sivusafan.pdf
    • 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_off0000f956.bin
37511e2e7732e5f56527963cca2b50b8b46eb0d1c4ef6fcc29b587837f4294c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 10692 bytes
font_01_sfnt_off00011204.bin
96e2a233c9e8ee26ec8d24f68fa262f22fefd9efffd5687d010b7f39ba0e18cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 16472 bytes
font_02_sfnt_off00013c94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 16792 bytes