Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24d83625aef210d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 06:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ea5e31c8f53731f7411b4f0df278236 SHA-1: 61b1c6b0d3306f2574826da2b00525011719d589 SHA-256: c24d83625aef210d0ba61f0f2d3f68702e5d1afff5e3fb16bdae73fe8ea9bf8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised upload storage, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=outlook+sorry+another+account+from+your+organization+is+already+signed+in+on+this+computer PDF link annotation
    • http://growlink.biz/userfiles/file/78713460757.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210901231205680980kr0mxxu5tl35.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091213590936.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/95398066350.pdfIn PDF document text
    • https://diphong.com/uploads/4695676322.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613947a89c199---8795329562.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/36503211654.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/somewu.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/zibotamoro.pdfIn PDF document text
    • http://infunplastic.com/d/files/93024520532.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/83406135009.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-15/20210915230954465831.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/99119086967.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/fogago.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/64413403257.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/59389838968.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/lebivesokasapowolezila.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/gjj8ekgrec7g2eeeubadpe50ue/xifiwibigivajoremaf.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0c55d0786fcd39682c57b2c70f2d8b88/vazugezarim.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/nopojafulir.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/mejujules.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/vinajekatuwulofepizobax.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/mepuzu.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_off0000d74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 17456 bytes
SHA-256: 84474bff4ff3d7178e4e065712886ad868bc6acf122687feb3f6660db04f1213
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 11456 bytes
SHA-256: 253f5e086bda60bda82dc1f27b001aa38aac00f8b9bbb5dcc9192c1a487912c9

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