Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1853b5c48ac7652…

MALICIOUS

PDF

89.7 KB Created: 2021-10-13 16:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0211256ab8a01795a1894e78e85f2818 SHA-1: a80ac3f270041a4fdb26749afb8c08da1b01deaf SHA-256: f1853b5c48ac7652ff1d587879b25772a22658d1e62d4076b4a6739514e56749
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to files hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple links and the nature of the hosting suggest an attempt to obscure the true destination or to leverage SEO tactics for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jlm-kg.com/uploads/file/viziges.pdf In PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/72412159182.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/83959638905.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/31484674464.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/ladofi.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/34633566425.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/duvavavefugolefoxiwugo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mcm32jfrkccf9s73g236gksdi4/jenuketiminamemebi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ed61ceb7dd---15942743796.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef2feaa6ae---wewubonosetixedumo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16156669381fe7---felusakoguzexer.pdfIn PDF document text
    • http://teplospectr.ru/images/files/81322853654.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/i11g719a49oo4usqboaidqvqou/4348618855.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/jokorupewizekidoje.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/lanizemu.pdfIn PDF document text
    • http://ned.ru/uploads/files/keluki.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/zasefigilugijeturigaraxum.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/pufavaxowujutedimireziko.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/bawezuxif.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/merogepakida.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/fokifenipatad.pdfIn PDF document text
    • https://pellevah.com/upload/files/suxapujemupetobojule.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161326752ad62f---bosapoludodewuwira.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/81128756721.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/60126476498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/vItLtdF7Pec/uplcv?utm_term=gaming+ultra+hd+wallpapersPDF 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_off0000f489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 19716 bytes
SHA-256: e63fe31cb576c1584307d2b1fd4b385bea0ddce4daae7bc92865580b40a1da83
font_01_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 10944 bytes
SHA-256: 841d40bad77f38962f0d19d762268b475f80efcddb70d723f7152b55b7a4804b
font_02_sfnt_off00014108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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