Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc288ace1997579…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 08:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c7e3a5465b766e08699346b32070236c SHA-1: 7ee97042d56aeb70c8ffb698ddcd938347239313 SHA-256: 4dc288ace1997579fc793233489cc04cea78586306d003a6bd5b01606163e50f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://ahdjcm.com/upload/files/xitafakare.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7e2b673f8---8335482581.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/dufoxomoburajik.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/14748867318.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/066957993ebbb3bdc29f7c6da8a943a2/34907158626.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wiwofamuriji.pdfIn PDF document text
    • http://snsi.jp/image/news_file/wigebukevamoniguk.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/55362879992.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090823060073499.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/wuwasobonitobe.pdfIn PDF document text
    • http://0048.pl/48files/file/sixonigulazuvula.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/83633712400.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/lusofugaxalav.pdfIn PDF document text
    • https://casaalu.com/luutru/files/96242999515.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/vevegabeseti.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/zebimafezup.pdfIn PDF document text
    • http://bubb.cn/up_file/file/79282731372.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/37141297879.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1258135710.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09e58c6de---fososuloke.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/21175999161.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/wutebakeretukoze.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/mafaninovamelap.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/posibiwovusuferajudonija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dan+the+man+unlimited+money+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_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 19736 bytes
SHA-256: c59bc722d3cde08e67bc905bb786ed9c5f9f1931d656558d01d95819a7678e03
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 10696 bytes
SHA-256: 02729ce0a962249d401918f41ea7e8f118237d5ae115bd711922119b2dd7ef66
font_02_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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