Malicious PDF — malware analysis report

Static analysis result for SHA-256 5056457870538e01…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 08:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92f0eb7bd97f661aaed2d6cfb414e8ac SHA-1: 2bbe05b4131e1e20c47c6e8a8c3e6da14fd8ddf9 SHA-256: 5056457870538e01f8517f5fbf98d4a85a1231ba7b0b469ef11405d08df28342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to host malicious files or redirect users to malicious sites.

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://eventpro-kontraktorpameran.com/uploaded/files/5362894888.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/irokemjtrpt5o4bqhf6ev3nkqk/80198419094.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/97323728866.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/losipajadejazese.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/nilupabeki.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/pipufa.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450da969efd---16796889928.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/pusawubozezetir.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/34883172142.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/ravifetunurivijagalefuxep.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pqju8l8e0idknhue83h6qnasb8/xetidedokavud.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/defenipujusadavebokumolin.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16150f10c29a34---gokanopukoxeto.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/44567618473.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/61468594219.pdfIn PDF document text
    • https://mavibusiness.it/file/rimekopetujerazarak.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/sutizovem.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fudofivifanizuw.pdfIn PDF document text
    • http://artio.pl/files/files/kelolu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819fd79ee9---39839715800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=yes+movies+freePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130becf4ac4c---xobugazaden.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_off0000acb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C9 10012 bytes
SHA-256: a3a5e44393c3db6b227c1443333c577e7de6dbfdd6cb5e7746f72edd4558203b
font_02_sfnt_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 15864 bytes
SHA-256: aa225285bd54110360df4a514273da966b9030786bf299a1f6174bee1736fa5d

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