Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee0a41c2acc5e5e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 19:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d3b24d29892797e42fa322bcc938e54 SHA-1: aadf1c7b9b4d9351145d571134a4b8e6b773e2dc SHA-256: cee0a41c2acc5e5e48e3ae5f5cbd7a25eb0f473aaaad0f0c43782380c5737828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

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 http://christ-china.com/filespath/files/20210907150335.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614623fa521de---katobuwudibibuni.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/95525385125.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614524335ec39---77992643268.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/furabonozedasus.pdfIn PDF document text
    • https://ever-progress.com/upload/files/busurewumiwosa.pdfIn PDF document text
    • http://bakoca.hu/files/file/fobuvajijuwevalutuni.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/gumisomirebawafob.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/nidunafufabiso.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/37798328121.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/15393520680.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/lesifigifopuperaxozunixaz.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/50030728646.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/xubefakipobasawedeporozag.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/xaxurewigodevalemudipesa.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/biguwekapajodanizej.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/binadabepufif.pdfIn PDF document text
    • http://husplaza.hu/editor_up/wamejonaki.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/guvajopat.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631024334bovomev.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0cd90ebd47cfa6db2ee3bb0f7f3a0494/80071584188.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/48246487207.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/8114678083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hacking+the+art+of+exploitation+pdf+free+downloadPDF 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_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 18052 bytes
SHA-256: fb8b8d272c3134964bd2a09998ade0d4ca7491837d11c78d6e4b873a10e88951
font_02_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 11004 bytes
SHA-256: 9391f23f416f0604a887fad9cc0f8332ba721362928abed5ed3f5d88253f0ed7

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