Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f1415e442969c8…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 00:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a1422aaa624244ed447b6949dd330cc SHA-1: 2439f7e00bffc31a5e3ec6fb957f22fca2249dbb SHA-256: f3f1415e442969c863964fc14323749cf29ffe62f0b7e432a0de6b89e6b1ca15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://catamma.ru/uplcv?utm_term=live+mobile+number+locator+apk
    • https://svenjakretschmer.com/ckfinder/userfiles/files/juwobilitosefa.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7cd2c62a---jikapaxexurubuxero.pdf
    • http://castel.lu/userfiles/files/xenakanuketepetepu.pdf
    • http://wenfengsi.com/wfs/WebFiles/file///2021091322334741.pdf
    • https://hutechsolar.com/upload/user_upload/files/45306775103.pdf
    • https://zaragozadenoche.es/upload/files/zupimaperukigasojoliromim.pdf
    • http://wdnederland.nl/file/76048882473.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256e2186d5---fopixubozemadiveta.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62a9e0d01---mazebubizanumipodirugara.pdf
    • https://ev-owners.jp/userfiles/files/lonefepu.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/dapedeneja.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2f5ef2a1a6cb7da963d942b2cf8854b1/jakepesobavogakarot.pdf
    • https://kildevangen.dk/files/mabajodamovarawuge.pdf
    • https://virtualpulse.eu/UserFiles/file/mudota.pdf
    • http://www.ciesol.es/ckfinder/userfiles/files/23419592014.pdf
    • http://pro-roubenky.cz/UserFiles/File/napufidavixinuju.pdf
    • http://trunglam.vn/uploads/userfiles/file/pezafetitekojowunogiza.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/gakiliji.pdf
    • http://dga.gr/ILC/img/file/17048637901.pdf
    • https://12shio3.com/contents/files/tazuxakugumoxofefevogar.pdf
    • http://kolaykanal.com/userfiles/files/paxitapew.pdf
    • http://cold.lt/userfiles/file/21190671970.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/62833964077.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60e.bin
d3b16842e4df7a5fbeb1f0d2c9793f3dfedc2886ade0862350d4ef4141d50732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 10724 bytes
font_01_sfnt_off0000ee67.bin
cc0ad51226e40eb39cd8c198492551c794628dce53a7335c8d3b3992107b1ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 17996 bytes
font_02_sfnt_off00011d2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2A 16792 bytes

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