Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f2e72a6cacb92f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 20:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fddb2b197e5473787f3be3f3256a9905 SHA-1: 0368e83ca003d9de8b705d00b94036c197cc5841 SHA-256: 90f2e72a6cacb92f27f95038ff3d8d06585f377588e5a5aba5601dbfbfdb1bd3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to disposable hosting and compromised CMS uploads, likely intended to lure users to phishing sites or download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://drlalashow.com/php/billboard/uploads/file/dapakoleverufekum.pdf In PDF document text
    • https://landbondcorten.com/attachment/file/67607d4f5389cdcb9108133fe1375d31.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/89260819913.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1632307653_2a0eb1c16f.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/wufutidekemomo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd36f1bcf6---wofiniripavimesilig.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c80987a2fc---4602377493.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906231252603142.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/kadekufedi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/5b3f537b88b5466b82d8ecf2a9d01317/9302805592.pdfIn PDF document text
    • https://12shio4.com/contents/files/5068599575.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a59e8e24---fadumanotolukekagitezige.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/15140344639.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/papofozasopevipovanifi.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/zafuvokomovitilemes.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/mexanulejunazexaki.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/puxoxo.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/305c51b3d5b501430a8fa3cb49f0daba/88750763755.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/93046637987.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/72627496587.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/guzosubapejeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=one+night+in+miami+watch+online+freePDF 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_off0000b035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB035 15376 bytes
SHA-256: 85de36ed0f09b55b4f4f713b8681335819b6d03c037e7dbdd6102207e6219732
font_01_sfnt_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 10724 bytes
SHA-256: 2177cec313a07c5a3305a05c9be965cd1073c97d36846e9ee6d00df968e76b38
font_02_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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