Malicious PDF — malware analysis report

Static analysis result for SHA-256 469f8ee4cadab52b…

MALICIOUS

PDF

88.2 KB Created: 2021-09-12 07:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 223543d1df538ea56f09220dc7dafe85 SHA-1: 77dcb2f790ae6bd904f836c6863daddb42d018f2 SHA-256: 469f8ee4cadab52bb759d98da3fc7a85c85dc8715fe9416782e436e7d5967efb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://krisoc.ru/uplcv?utm_term=move+to+external+sd+card PDF link annotation
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/95927152826.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/58031522396.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/nikosamibunaje.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/ruvovavogezurugilodip.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/loxewironunivuzufos.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109101649394046.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/fopixazomewe.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3713f6a2365203aa28558f572ffa66df/86371682074.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/94362561302.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210902045006.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/67208777927.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/bepeturawubowisomiwixux.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ce2042bd---xuditomotazide.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210908064556.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/tufosegejizegazevaberaf.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/70729304051.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/19352127565.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/fimeb.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/jojedujusezomefova.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/zitopukezolojijoribew.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319c81712b6---71497903177.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/80586205714.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/pifurekorokexujipudifedob.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/62790969547.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_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 10432 bytes
SHA-256: 1074e94c845f35f5584811a623d2eced6b194435da423e7c23e45e2b0277d463
font_01_sfnt_off00010b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 18424 bytes
SHA-256: ca82039721aa5e78d549fc573dbc61cad729015d2acac68083c30dcb362e8626

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