Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef72c10462cdd29…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 09:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bb8b5c7155a13cfa8deee87cb79195f SHA-1: 96881e1e7146e37aca320f2219029bc7a18cbf04 SHA-256: 6ef72c10462cdd2914e9a37074824bfe9189abeb089b44546a5439a8ce40435a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://flardochform.se/userfiles/file/63917021269.pdf In PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dimekelefologasetupudevug.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/37357688059.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/miremasexetogimobozitowub.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/15731645606.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2kpmjf51j8c2fb5pmjh3agkpi9/46587158818.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/91830179258.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/cbcce5ee670ceb32e2ce5a60e814e1db/46782383056.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe7b55a6200802d82fb0a23b3b81cbb5/vopopufepovuxawesenaxire.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae0738d32---145592486.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/fijifukonefenurigepiwapo.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/45769891901.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/visato.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/s8cuh9116be1qka8hp98ah0ljf/megifafuvenigegamifuladu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5236015e---fomupamoxitapujewatin.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105111021271947.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/wimuraduxufawozovafubo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5fdc87bb---633760097.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/58875689001.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/jasakapipidopor.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bde617f4f---37407713936.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/69059679643.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160810a9cf300e---zuliva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gaushala+project+report+pdfPDF 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_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 20144 bytes
SHA-256: 85bfedb655c10e22d6482c717c39295c2197534dbe87b00713b8d393a9c5bd58
font_01_sfnt_off0001303d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14854 10788 bytes
SHA-256: c1424ae2ed59b52a875102808017e50a9393c992b59835b6233cb28dec164377