Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce23e7a511c790c…

MALICIOUS

PDF

158.0 KB Created: 2021-07-15 14:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c8d1e5493b76facd9bfecd5c8937b651 SHA-1: b0f010c3b0bc9ffca4a6e00cb04390c8e32f75a5 SHA-256: 5ce23e7a511c790ca263e613c72acf203da8f41d5d0fc9c0686d6599b4fd3908
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://inwebjor.ru/uplcv?utm_term=perry+mason+blind+man%27s+bluff PDF link annotation
    • https://hostingalani.com/calisma2/files/uploads/31019014004.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/38115470114.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1eba6f5f21b1a208aa9545d3d853f823/66861754819.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/40733102233.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/sesagu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f2l63324h90kgu0imovbmskf26/21249215715.pdfIn PDF document text
    • http://momsystem.ru/public/file/novogigapol.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160af72c6136a4---kivikomo.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/titezalafolegilupusipug.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab793f8c516---44207735050.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/nelelujukurogolav.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210702225545_1r2v7m.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/96138028149.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/7b10d3c8f0a3ecab31095f639e8c1f08/23690383408.pdfIn PDF document text
    • https://togeltop.net/contents//files/27004386775.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/semamogoxabivufire.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/lunajusaporegotox.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/smv1oehnf6vvn1qr6ngqd3n3ck/datixak.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0u5ar88ft0cm33mmrtsvs2aje8/55453516997.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab54918fbd---xamafidewikexi.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/jemokepo.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/i29uhu4lu9hok1mdeocr7t0o9o/xonaxebuxijapuxawofuji.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fa506c47a942ebfae919771d26eb90a/13813412317.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b55af52bfbf---16535904538.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_off00020a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A01 10808 bytes
SHA-256: 1be7372a5d09ae6df2717efde517f4e085da3fdbe2c35f7c015cf08344d42c6f
font_01_sfnt_off000222ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x222EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23B01 18336 bytes
SHA-256: 727ffddb4f8bba6a2457331986ceca2e589e72a1a1ccccdcdf831cfc594cfa18