Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cda49662f7db607…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 08:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da3a57eb1b403b485e6d7a8de408ab18 SHA-1: 5fbe831a1b26572fa93875fc6fb7cd2f68706a17 SHA-256: 6cda49662f7db607c5eea795968da64f24b8ef1390ea38916cf2880a849b4d9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=real+free+robux+codes
    • https://beautydiction.com/ckfinder/userfiles/files/35564867262.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/34980290752.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fe2e375a---puritoredu.pdf
    • https://corianderedmonton.com/ckfinder/userfiles/files/sinisepavopabadupuxif.pdf
    • https://ms2oke.com/contents/files/fesibibaforodiroguwureb.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b856566d---4139220154.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/2044432515.pdf
    • http://www.petersonassoc.com/emailimages/file/sefolitunedotaxunivemov.pdf
    • http://wib24-admin.de/uploads/file/nixifixixiwadilulowewixe.pdf
    • http://tuivaivietnam.com/uploads/files/38117144718.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d379f5a02c---badijugiresivixorukagum.pdf
    • http://an-professional.ru/img/files/file/59073575548.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae6d0eb0f---nolabowu.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/35788758453.pdf
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/25757368377.pdf
    • http://eot.mn/uploads/userfiles/files/komijatakepotakela.pdf
    • http://chafewyuok.handysociality.com/upload/files/dedifis.pdf
    • https://dukeofmarshall.com/ckfinder/userfiles/files/labojo.pdf
    • http://eska-lift.ru/userfiles/file/xejibinumubusodusi.pdf
    • http://accapierre.it/userfiles/files/romiwodokabewutovobeniser.pdf
    • http://cecev.com/stockages/files/91067483465.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d08d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 16792 bytes
font_01_sfnt_off0000e8a4.bin
70796a2a460842843f2be290f6cb0bd67bab3b10c907f1f6ab6f6f5dc9d85b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10560 bytes
font_02_sfnt_off000100db.bin
07c63d1741ec6baa251c6f7d45861672c4332fe79c9ac3f5d3e0012a09c91a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 17308 bytes

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