Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ca75ffc3160744…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 17:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7dcbee5684a4e1b4f7481474c66b9542 SHA-1: 07b877b580465517b1065af9cb56f29ba377afb4 SHA-256: b8ca75ffc31607442faeea66484e8bf89378e7f5c03f03c2425352437968247a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://pharmnet.cz/ckfiles/files/files/fomebir.pdf In PDF document text
    • http://yushendesign.com/images_fck/file/1630528370.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/ganaja.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/lovomegowipubojasidekot.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/84388387984.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/2jk2uodhftkvi9r13p5f6mo9uu/58074624086.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/jigedajijiwoli.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/sowulajixasapakinedebe.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/vebuza.pdfIn PDF document text
    • http://apothepharma.com/upload/files/fabanevodajepefoxolumu.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/20009654822.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333f67aa9b0---tabigelosugolumabi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/d7v6qs83lspp0rcagibp32884l/gojuvomikevimame.pdfIn PDF document text
    • http://vln.nl/files/file/lineboganurek.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jarizewaruvumun.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/jepekivefoxuxuliji.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/83a0qo1mfosdo3vavijpp435j3/nuxafet.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/28847360227.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c53653236---totidexukumiju.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909093757.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/betusirufezubunev.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/zoposadokas.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/240897946.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a61839638f---ralenigelinonur.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/88347234086.pdfIn PDF document text
    • http://hanyuchina.com/upload/files/48227091421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=god+of+war+game+download+androidPDF 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_off0000ba8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8C 15164 bytes
SHA-256: 0878b4ef0f7314575f6e72787df52d7debfed3ee91ad4bca1d1c963562f86c28
font_01_sfnt_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 10556 bytes
SHA-256: 734d793e131299afbfc684597378482a8c32598ebe399865647b8651b31235d5
font_02_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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