Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cac2f563dca73a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 06:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5457cb51c4b39dfbd19595e1d571c328 SHA-1: 64887288fce97870318c373679de93d9148d831d SHA-256: f9cac2f563dca73adc3e08688e507bca3766f89658fbd8c01eeb40d8bc1726a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=exercises+present+continuous+for+future PDF link annotation
    • http://leebyunghun.kr/new/upload/board/files/jelab.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/remuxemafodelin.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/xaxidezigizuliwuweg.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/24214105729.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/73953317326.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/335003758.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/koxibosivekopoked.pdfIn PDF document text
    • https://topconta.ro/userfiles/file/noxaxom.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/79438537574.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/58540403959.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/wofukiboxileju.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613771d23a8a9---pofepujepunaj.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/93519382622.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134696012749---22928982350.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/jasojebovitonuzik.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090618282073499.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138670cc3893---navetagun.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/zerusidumuwu.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/salab.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/nusixifogefofugaz.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/nupufaloda.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/84601270726.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613690641EBFF.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/taboxozeguboti.pdfIn 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://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_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 18180 bytes
SHA-256: ed6d82c35e6e299a913ca67f8c943a07d502c308d89b1d424f965db1f32d7113
font_01_sfnt_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 10448 bytes
SHA-256: 041d609a9481a852229f1c6adf6a6b89f54d68f1fd3c88dc8399802595c9f891

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