Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f04a18cf367802c…

MALICIOUS

PDF

93.3 KB Created: 2021-09-10 23:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2d620be7fdbbf16eed5d3eca1c0010d SHA-1: 0d6f2738d25ec6dd95a83cf218f02b5a95e2ad52 SHA-256: 3f04a18cf367802c6a7fbdee38ad5cd81ce82f63370b712191a4b0a0894de51d
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/tusijopifuzonafulolijowu.pdf In PDF document text
    • https://majubesar.info/contents/files/18831341060.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210902002820.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/kamidafisipolub.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219393026.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/18744541776.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/wojajefikefamonuboparaf.pdfIn PDF document text
    • http://finchamauto.com/pics/gamenasemuduvadov.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210905063823.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/26453391297.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/78412534589.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7f87f1c0ee07fd89e0489aa7e64c096f/kexafixigakojit.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/60946193485.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/mebekuxuzowa.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/mikodeva.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ea051376---vawemoli.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/todirix.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/20783039946.pdfIn PDF document text
    • https://fultoys.com/userfiles/7222177900.pdfIn PDF document text
    • https://everestart.com/images/stories/file/21146186883.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/fudabigubinaruzulek.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133436f72a3f---53025582377.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/44520455807.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/rumobijipumezotibukune.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067686fe54---82434553605.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210904023814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=seo+keyword+analysis+toolsPDF 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_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 20124 bytes
SHA-256: d842ed5647cf41dad21f593301137dcd5346ca229361812c111c0862a8f5bcae
font_01_sfnt_off000136f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F6 10608 bytes
SHA-256: 7f3b485603a5c769188d0e2a92e593197ab26cec2b6ce44f0ebc1ddf8f1ab30f
font_02_sfnt_off00014f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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