Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca47a9ca2b32f2d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 23:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0239e0ba48dbb9f397ea4b0c5dcf8f04 SHA-1: 0d8623e4c022c59d1b7f6ebc478621621d3de199 SHA-256: 3ca47a9ca2b32f2d5b1155b5bb7be60386208da046d3e57d38802861413e7b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/31796502373.pdf In PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff458b2daa---79833746407.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/mamixituwupuzerik.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/desomebukitusotuwezorapav.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/33658379096.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/47813917722.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144b7e3a5e56---83032768835.pdfIn PDF document text
    • http://hidramaco.com/files/files/5091168381.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/xufezatokuvureluba.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/gupetufaro.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/dozogatovexelibobivabokin.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/41248b4e34327b48a8baa5b8b5b541c6/xusiloranajifivinom.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/vozukepagawirokofaxamo.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/detujiguzepavuxafufarazi.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/jomogobimisuboto.pdfIn PDF document text
    • https://windsbs.biz/files/file/66263154911.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ac618362ff164ef07ca8542542d41415/tijejijobalaxuwuv.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146610bc4a46---tejifaxawuxap.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q01e745jecdi7hj6niag10ouc0/taminosexidulolikol.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/82473185224.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/vefakuvupifuv.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411557e21bd---labavudi.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1f44cdfe---rokalufukufovesibop.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/96263112650.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/kiguxubifebesuzorenewivop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vidmate+apk+download+for+osPDF 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_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 17244 bytes
SHA-256: 16c9c610b411a5fb5ea0a3b2078eaff27b8cdc6c31dec633976c0d7a6d184ba9
font_02_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 10808 bytes
SHA-256: f66391fa58c4e0c80288082d3735e11a7d5540a62af634020788fb872b4e7304

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