Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffdcfda34ee55d1…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 02:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a6a6acd8c84a3744caafcc098ed3f9b SHA-1: 359fcaac526b5be1cf004aa461d3c81a6cd9302e SHA-256: 7ffdcfda34ee55d1e59dc9c2f8379cd86cc693434de4ecacebb1f94f984d3d21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, potentially exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://promtour-rural.ro/userfiles/file/51568875644.pdf In PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d26600a2---tagegilizolafejemidaw.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/tukejo.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/16495126706.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/38408262594.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/wutidafaw.pdfIn PDF document text
    • https://cakkue.com/contents/files/67996611791.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fomidetirebibetabug.pdfIn PDF document text
    • http://soles2walk.cz/data/file/69228356037.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109021108081219.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/84391054340.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/40259782673.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/22888680224.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/87206854618.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/60625533316.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/nabuveravubad.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/niviwoxifuzababi.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77377953875.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109090504154861.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/52468740856.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/71920421743.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/faroto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tekken+5+game+download+for+android+apkPDF 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_off0000b705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB705 16620 bytes
SHA-256: 0f384dfc2b42194d0363b2d4f69e53709e722c526942fb6f31e4120a28e2e613
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 10852 bytes
SHA-256: 7c6c278a7a7e9992c455ea93e957d6044bd89088c12b66f13f82160956b31eb1

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