Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8967b7db415e67…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 06:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68133d9f1018688b9a44153ee845e6e7 SHA-1: cb5bdbcbbe85139d50055eff79c91694d90536ce SHA-256: ed8967b7db415e6753a7f6afd9f76fc094e51667c31ed72783044f9bf89f6843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.ville-dammarie.com/ckfinder/userfiles/files/62830489093.pdf In PDF document text
    • http://kirsanov-maslo.ru/uploads/nured.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mufexo.pdfIn PDF document text
    • http://ellev.fr/upload/files/guvas.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/47185248177.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mejilejumilisasazofejavus.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/mowiwoxafanupepapekubil.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/74506501232.pdfIn PDF document text
    • https://ebooksweb.net/files/file/reweboxulugi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613910e976fe5---34996833635.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/fewuzukanutuz.pdfIn PDF document text
    • https://phr4u.com/files/16986372604.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/xedurazujisusolok.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/33721474468.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/57875734408.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135841875011---mijozukumeziwozadenob.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/loweb.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320baeaee7b---53553186915.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/64646434480.pdfIn PDF document text
    • http://www.moyekolodin.com/files/budovulu.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/vilivulezukozosipofodala.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614147082b1b4---19624229530.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613526ebdd7d2---14849642640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+download+a+webpage+as+a+pdf+chromePDF 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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16788 bytes
SHA-256: 459f7846c148a9fbd37d72d1004c2b2d130fdca21d285b9d31f476858ad1e099
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 11192 bytes
SHA-256: d7562601b617358b2eb5c2f1bfb6e42afa7c2dd9ca2a45e50eae5a6e9a722846
font_02_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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