Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab63152d9a388ab7…

MALICIOUS

PDF

77.2 KB Created: 2021-10-03 07:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1c551850c5d4b9479a3b8c5d8538a0e5 SHA-1: af5ecd2bc7c60bd3ecf066204260d1b3a7c57569 SHA-256: ab63152d9a388ab73c333d6f4ed7d979a5e9fab5d4d5730e57e9f57a5808d814
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cructi.ru/uplcv?utm_term=ultrasound+in+obstetrics+and+gynecology+pdf PDF link annotation
    • http://kimandyoo.com/userfiles/file/76751473183.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210921115617.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161503edfb63a9---patuzufunukekimevare.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/lobitevolowafarebufikax.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/62134121279.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/famomedarer.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2720c2d5c---11477234079.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/92836424850.pdfIn PDF document text
    • https://ghnservizi.com/file/timelogulidew.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/bupodukuliwexevunavajom.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/43066c02a030bcfbbd64f7f1959df689/97812439608.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/sitevosalewefixefetaxage.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/6713562082.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///kekegififazoxavaxameru.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e2c752b7e877cbe7f2f174ff4d12c0c3/zoxopareraginer.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/lunilofusijujixu.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/75545799270.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/41485340783.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/42338125502.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bdb1848fe61a73757ffa232a9de661e5/xadutavuxin.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161414694f278c---98175182240.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB426 11156 bytes
SHA-256: 1628520b6077bbdcab2df24e154f4e0eab6f269ccd6648b658a10b87640f7521
font_01_sfnt_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE608 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 16648 bytes
SHA-256: 064d1d79da50996affa9e1978ef398d9cade21e5e8c267b6cf3acb6cdc028464

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