Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3e376063f869b3…

MALICIOUS

PDF

75.8 KB Created: 2021-06-19 05:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 40926cb0dbf2b037399da1a6ae5250a2 SHA-1: 77bf6313243c8dbd35222d13a80137a6320e27a8 SHA-256: 0a3e376063f869b3f72fbb8fb2d696633428bd1407ccfe02a82bb6f24cee5173
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609cc00e084ae---52326096434.pdf In PDF document text
    • http://stalmost.pl/userfiles/file/vafukujowagigatetimiz.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/dotabuj.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f94663b48c48479261cd531787ec9d64/wibopimovur.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7644999e06---jaluxizeligivirupunop.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/83901712786.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68b654370---60150723856.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/5358525975.pdfIn PDF document text
    • https://topupdana.com/contents//files/lexuzasisopos.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/94830997533.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/29257796861.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/60cdf2aa8a62c6e08cc0bc433a3978e9/salogadeko.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0f80263f---fovilojatugipiwida.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/63992343820.pdfIn PDF document text
    • http://ekotronic.eu/files/file/24715119831.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1052841463609fc5cd30d66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sociology+optional+syllabus+upsc+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 5572 bytes
SHA-256: 0d6bf690790d5ad84a7cb13268291cf3d8109f17b34d67cf3728b9080c501f44
font_01_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 10504 bytes
SHA-256: f14b494ce459ca81e09558fc1828ef0f4827e0ef72e3f39dc9337aef46e4dec8

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