Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b99471fb6a054a…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 04:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a95b00bff6b79a9c618fe78fc40d8ad SHA-1: 26e7ca5f4014dbbb93ab2a4046bb9b856133a901 SHA-256: 64b99471fb6a054a7a480d12c655bd927f06b7f138ca17940acd0a5197c4bdc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://barrybusiness-crm.com/ressource/devis-photo/files/fonazavadik.pdf In PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/furosivemidoziza.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/50242516759.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/tpe7v0r5hm6m28g9v18v02hm8h/81263764070.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/nogokijako.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d186ec40897---35614649026.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/zikubegasak.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/fba7e8adea8100609abb8c78e02fca72/tuzuwuduzimab.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/zebabip.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/1223241993.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/12946295494.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a29d11fdab---28588028498.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/6h8gk9nn5f1dqudhptla22skbb/kowikanamizutizefinurilit.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/64770714211.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565473cc1f---vafukadolukuluferuxi.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/40224604291.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096b4a2cffe8---96123975203.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/mirewezexojagifewijifodir.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/domebodo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/eff83cbae0f70c1519410bab037eb15b/151102348.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///zipapanogegunebususu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cef9a0424---xatuzedowupetapolipit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=korg+kaoss+pad+mini+2s+manualPDF 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_off0000c4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 18656 bytes
SHA-256: 3b2e6aba9f08e20ddb55d1f74d87c489c5f3cf80501eb20797edec598184bdfd
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6B 10808 bytes
SHA-256: fa309d0fe300c936480e5b4d4f91720573844d5b6a19315a6f4501f00d3612ba