Malicious PDF — malware analysis report

Static analysis result for SHA-256 28825ef902e6733e…

MALICIOUS

PDF

93.3 KB Created: 2021-09-20 11:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b9d0dbdf597893c8b1ab2bdc1f2f93bf SHA-1: 9c749339b2d8b6e7cd42831295e62acbf03134a8 SHA-256: 28825ef902e6733eb67dbf2ddffd462270a869dff1980f91772177c54ae096f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The presence of multiple PDF_URI heuristics indicates an attempt to redirect users to external, potentially malicious, websites. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://trungnguyenjsc.vn/uploads/image/files/5800553241.pdf In PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/rerifawijud.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/melisabal.pdfIn PDF document text
    • http://kelsenator.com/userimages/81203327809.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4a81856ce5cf8fa56fa70c10d917c53e/61443693889.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/lifagasibaveketa.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/733f6a01ae3cc46a45970d1aa6636c8f/domitorerar.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/vilumunitugebi.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/27362946747.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b892d53ae---72613673583.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/favuperemegesiboromat.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/pidoxudumidamiluduselizo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ba68dceeff3dadb665bc3eacf6847946/80650619183.pdfIn PDF document text
    • http://ux-school.ru/files/files/tokakupobojemekedexusawet.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf15e2a87---sugos.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/xexetan.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/65347165211.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/31313244715.pdfIn PDF document text
    • http://iltorg.ru/upload/file/xelasubinukagajuti.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/65435803997.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/tavojuzitaf.pdfIn PDF document text
    • http://newworldss.com/uploads/file/voxomuvasebugavafizuba.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/lizotepewitu.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/lotulazoke.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202194224549458.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/058249bec87b1a2152937abca1f2639e/83902235523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=write+nfc+tag+androidPDF 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_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 19060 bytes
SHA-256: 0de586415fc4b760089046d53589d1cd609b64d0e01ba3d243f37d8c557a0932
font_01_sfnt_off000137d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE8 10432 bytes
SHA-256: 9e1b5f6f14066ec37404b574050e4d472c7ba9559d7d25b47e407ba44bc5a5da

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