Malicious PDF — malware analysis report

Static analysis result for SHA-256 697559c8f19432d6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 06:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a23842a6bd9d27f9bb914cc45af252be SHA-1: 075f5326c8b930f0f55f2a8af258f226b03d1f15 SHA-256: 697559c8f19432d6ee58d72f85c7ac6c6b4b3dde5359f7724ff53eafb0839f44
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0462ade76f---45325133561.pdf In PDF document text
    • http://honmamon-s.com/img_seminar/userfiles//file/foxigo.pdfIn PDF document text
    • http://kag.fr/userfiles/file/ganoguwore.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/mikojote.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/ferupub.pdfIn PDF document text
    • https://vestol.bg/files/file/15745664374.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/10585002135.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/libuwov.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/13b71e26a9be9604561ba4b6990c1b17/fenabanezutilixazulevofe.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/dotaxawivixa.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/v5eg5tbkv0qrc7hi99gafo2hr4/89962160929.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecb60c3ac3---netinevegugomesoxozu.pdfIn PDF document text
    • http://change4best.ru/upload/file/6660003595.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e6bab204c---71715535829.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb8b55cb9---wuweb.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612701245007f---3193588195.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/38696978281.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/sejuloviwufedetodekuzu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/lda0gpif4e9r86fc0vqntpm854/xawif.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01bd65121---29058825538.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/6gh8h7iq6ql1mtv1mi4s1kob7b/15097350665.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6928c7af6f671eea684b0c489d1103eb/80949971272.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/wemuwopezinod.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/lowujekexigaxodataw.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/baxomara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+model+maker+listening+answersPDF 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_off0000d57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57E 18544 bytes
SHA-256: cecbec7a2f4418385576e2be743d5f6a19ba4c13fab9626f98cc1b0992e7a879
font_01_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 10836 bytes
SHA-256: e58b79c7edaa32da0b3db6af893e7714e26544d58bbedeafcec36894ba892b82