Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b375cb65f672cc5…

MALICIOUS

PDF

99.1 KB Created: 2021-08-10 08:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 619a9bb40ae74decd14d3aa80427eaed SHA-1: 3faf8672a334fe1fab640450a9504f48b8799b7c SHA-256: 0b375cb65f672cc5e8895f678124f9090cb6cc63d2f92e24f7cdac0a65ef27aa
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=dead+samurai+cheats+codes PDF link annotation
    • https://chung-pei.com/userfiles/file/feluno.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/59426337140.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b41be68d5c1---61199345659.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/9101930372.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887928c4a9b---pitolusuxilalinad.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/6259966508.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/murakofobak.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rn2egejgfemee2v69j2gk34l53/sajazi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d3f7823e98aa1198f2f0ddbc7af46d38/jinevebivedubogemarezusaf.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/11721594059.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/38458736608.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/delomu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160707b8f0bf79---musawozivodopo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607de1f88672b---mejopofevonibegijix.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///93355355817.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/75023816464.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/99a8e3e9e7eb64e53782b62eab8c53a6/1326898063.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2ca19ac2f---popinivofugapoxuwezovimal.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ljabmke2rqafj7tjicgutjc12b/bimugevupu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/varorubo.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096360256d7e---76234444329.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/ferul.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080faa188584---64270280611.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071dfe4cea9b---79895697259.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_off00011d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13596 18968 bytes
SHA-256: 1e0a126b5e8a39b0a3f722529f2d7b2bcd5543c54908a30ca5d5f8a488497a5a
font_02_sfnt_off0001658f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1658F 10584 bytes
SHA-256: 1f70970845122ae2da619ad0fc52e53fad08e1f6b7e44f1c64815aa62e71edcb