Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0f0f6f8909ee03…

MALICIOUS

PDF

75.5 KB Created: 2021-06-23 23:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7bced79bf3dcbfbb3387281d9a6ae78f SHA-1: 4e006925cfb4aa0b5ab8a9f9647d82a636a99bd2 SHA-256: 4b0f0f6f8909ee03c74581fd8ecd8b5f1ecbf4bc85fabe7484dbbd0fa412f59a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://smidgel.ru/uplcv?utm_term=algorithms+to+live+by+pdf PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hq15gq0cge3tft5ikrs8lg4ng4/50473433227.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/17970138542.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d0c41cdf2---nipim.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d91280959a---nafojinodavukelorubenubu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc9eb09b6---tetubejokafufusozi.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/zaxipinuwemofo.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/fodifinawelufamumizedugoj.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d073eee359---28576051520.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ece18b7b885187c2d75a26c270f5a249/71600553179.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/zunogapur.pdfIn PDF document text
    • https://akvaguru.hu/user/file/5026377814.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098418de564c---kovugat.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/15701867576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 5536 bytes
SHA-256: 1cd434c73248c32b252f6e973a49962347c385a22e07ddeb75c572d02f02c473
font_01_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 10708 bytes
SHA-256: afae971e9e64449957b5cdf5d3f8ce10920c1e7edb949562f004ac6bbd17e1eb

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