Malicious PDF — malware analysis report

Static analysis result for SHA-256 a801ca45056f0b7f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 16:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9389772168bd8a82960d3c9bcce05dda SHA-1: 98222489349cd80913cd9f8d56bd7ecc0b42134a SHA-256: a801ca45056f0b7f3e1e8b1856775e214532d01ce696c3e2d77dd08ff03904c1
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The PDF structure and embedded links suggest it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://griby.biz/ckfinder/userfiles/files/xeget.pdf In PDF document text
    • http://emekyesiltepe.net/images_upload/files/zugem.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/40940224992.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/nulazu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086e247ca9e8---pukopunufim.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/xojonujefedosedifinoloz.pdfIn PDF document text
    • http://a899.net/userfiles/file/nufaxax.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7863ccc8a9550549e44b0d343832b372/66961948789.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/sapadon.pdfIn PDF document text
    • https://schmitz.cz/res/file/15465084977.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/surimusivovigotutumin.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c30ec51469---25308620519.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/33502464595.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/12518004542.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/de8o3scklmsmga5fmjnah75h6p/bupemogunogir.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0800d32f7---takijufi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/oosoguhojb634m405hgq7k5li4/89977329718.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210821_E41CA29D6FF9035C.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/4878460672.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/23007737560.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6597020a76---94940113984.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/li92tpg488nrqhlv3qrj1884u5/gebovoxoroditu.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/virasuxepofusoje.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4n59ocoq619fo58qg00vsi9fcs/60968607078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=technical+project+manager+interview+questions+pdfPDF 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_off0000bb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB13 11560 bytes
SHA-256: 55621258ce0a4831b3f48cdcc93f919a0021b306feb12247d09e764cf3c4ce70
font_01_sfnt_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 15380 bytes
SHA-256: 5b285dacaf06a913aff670ad002d998c87e0ca95a9421754c11cefba6c931e6f
font_02_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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