Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd6bd9f58e37997…

MALICIOUS

PDF

73.1 KB Created: 2021-09-19 13:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb1c2ae4340188a889662528fbf02392 SHA-1: 0befc929f5e4892fd1a7dfbb3a3f577638a448db SHA-256: ddd6bd9f58e379972bf2a6db175a02bb6e3b2637253331699f694dadcabe3556
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO poisoning. No scripts were extracted, but the primary attack pattern involves luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://madveras.com/ckfinder/userfiles/files/98112565430.pdf In PDF document text
    • http://ibtaker.ps/userfiles/file/tabubejuxawipusapi.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/jeropotixitopetotoboruki.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/48976428783.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/retugagoragipaxanop.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efe4c0c217---koxexivedugukebadu.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/18030644670.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/74a25d40377077e3b0c9de67807100ed/59631681033.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/zukekonefedezinotukolisor.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46049662114.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/fumuf.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/regedonusajegovofo.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/63552890251.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/musotaziwileb.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/3241411556.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/85451889461.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/10825191114.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/gupirugugikegifi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd32ba4da5---silawejubidupomob.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab341823c---josefatovewavitimopel.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/napepasomiposulomir.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902053050104697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=warrior+cats+darkness+within+pdf+freePDF 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_off0000bc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7C 10844 bytes
SHA-256: 0ed72f9c19454186bb18deb958c036e5497cbedfdde88c1b13cbacba2ff2e8ab
font_01_sfnt_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 16164 bytes
SHA-256: 83d8986760ee6a94dac2f1e709169a58e89b9e6505238b9f0826f4605cece2c9
font_02_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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