Malicious PDF — malware analysis report

Static analysis result for SHA-256 23da889718ecb2aa…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 14:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 03ee31b30d9d1d8144affc093142f0ec SHA-1: 376bac66b8d0f1d12fcb1e3cc9e5e33c79c58c9f SHA-256: 23da889718ecb2aa31624d6deb96d7dd5a3221a3bf8425c7c22be9acb2bd0f0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories. These links are presented as a link farm, likely intended to redirect users to malicious content or downloads, as suggested by the 'utm_term=fs+18+download+game' parameter in one of the URLs. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=fs+18+download+game PDF link annotation
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904150107961186.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109050021525483.pdfIn PDF document text
    • http://tochuchoinghi.org/files/liwijepukobaxebopesi.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/3925071441.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/zedomonekojaki.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490267b7528---pijexipamefaride.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/34176942802.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/rorukototula.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/varabulesej.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/suvusegodenaluwivovoti.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/15394445239.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3100a55d680ac0c34495bc55eb7614b9/farokema.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210925140059.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613433797cadc---54579420970.pdfIn PDF document text
    • https://eklyps.net/images/file/69058137580.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/magoxerezefunizidil.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/bufuwa.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210915225943_mdxn05.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/90555165524.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/banizumix.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/49554265099.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/63615333989.pdfIn PDF document text
    • http://nfc.soo.jp/file/suguzuwixopo.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/55535809226.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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 10624 bytes
SHA-256: 499d97f2ac3c9ffc42e7ce77ad9eed65eef6560b05ad49e206a59cea41779232
font_01_sfnt_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 17048 bytes
SHA-256: d02543327c84348fc31dfe765a6688fd85afb163af12ea1bf376bb42610ec004
font_02_sfnt_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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