Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4120d714089e015…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 06:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee816020a6a4a60909d0cd1b1d1ff16f SHA-1: 1b4b946636f8a04e474503ae9d21c10d405a207d SHA-256: c4120d714089e015ff1b3034f628729acf751330e0dd85d52d96d3db5f036589
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=best+pdf+to+word+software PDF link annotation
    • http://domplus.su/userfiles/files/2893509848.pdfIn PDF document text
    • http://getdol.com/page_data/file/ninujoforufabode.pdfIn PDF document text
    • http://ucokampen.com/media/files/fowaputoxapamuke.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/5rgr2454mbvpu9mblfjjpdhefb/75173612120.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/jukegusidixoropo.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/56455196990.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/nirogi.pdfIn PDF document text
    • http://taxfreepoint.com/file/fumarakabej.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/45604506113.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/zemojemifikidudorileje.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/26799676737.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/31630554415.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/62529998662.pdfIn PDF document text
    • http://qdjshg.com/files/file/bolekabixogovekixoko.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141053abc252---fexenipexonugimuz.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/88262071557.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/raduraxozepogisusenosimar.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/tuvomilabibibovotar.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/54406918397.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/3337767858.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/gakofilinebolagifitanirex.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451abbebf93---tevavinegolifixog.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/zasuwodatesopubawod.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/vuwegavevuda.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/80908336011.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_off0000bd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD34 10388 bytes
SHA-256: f63caf59464a51676a68e9c24fd0db59e7d6d0f9901f93de681be50821bec37a
font_01_sfnt_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 16404 bytes
SHA-256: 10da99a20c185b8f6d578b35eb0524128938291aad588a8691103f7e13bd14bf
font_02_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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