Malicious PDF — malware analysis report

Static analysis result for SHA-256 e471d8e4df08c696…

MALICIOUS

PDF

71.0 KB Created: 2021-09-12 04:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b4f4715071d15824d389aa99ec724ce SHA-1: 40381e92708eff273576dff62d484820ea155dab SHA-256: e471d8e4df08c69600604507e6b44464a442fa573c46ab01545551da1d92a03a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bhn1c8v2lgp8ssvrq6oqlq73ka/28473417972.pdf In PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/45995597287.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/58644508497.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42f8d1168---4003209771.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/rudovifobufo.pdfIn PDF document text
    • http://agro-partner.com/Image/files/76866692371.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/mozebivirazezalaxufarojux.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba69635be---vesezu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0e922d35---siwafepaxaxavojedep.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/gufupav.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/wuginure.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///23641418717.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/gudakawesokigovifej.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/12774879035.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/84599155551.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/84460235255.pdfIn PDF document text
    • http://tayles.com/uploaded/30883945491.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/52636842940.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/xamal.pdfIn PDF document text
    • http://offerparts.com/upload/files/gonoguxinos.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/benefibifepezijugafoxew.pdfIn PDF document text
    • http://talleresjpg.es/img/file/97453540025.pdfIn PDF document text
    • https://jjpremiers.com/files/tizarinaramikofufagovet.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/dapirorabalaguj.pdfIn PDF document text
    • http://sin-hua.org/userfiles/35780762740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=send+files+to+tv+apk+downloadPDF 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_off0000b4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B8 16040 bytes
SHA-256: 8492a6fe1c8b644aff4f03285ca12818ad046cb12d180299ae3d312c0f0c167f
font_01_sfnt_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 10708 bytes
SHA-256: fc8e41d681668604a84c4779b81f93929215c133542ef095696fa40a2fd5b8c3
font_02_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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