Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb4925b3e4ddbb3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 11:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06d2d6fcc37a6a1d0379879c7c5476ad SHA-1: e131645f80abbc6efc2ab4464e7954809074f06f SHA-256: dcb4925b3e4ddbb305b5532ac2131584a719076dd3c1c28b00ee35cc7ae4eb95
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these link farms indicates an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/8834076456.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/da037b7e4ed288df6c16eee82f6de669/bujetamijadazebinisupa.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/66392062985.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/88825346972.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde2e7b6e0---4006610661.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613979fc7e637---44723542410.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/7ienknfh4svhuthhh3n0hj74t6/mavokasob.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/lomofebupoludazo.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/duwoxejokanoma.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/jiraxinolumita.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/dadalezikuluzi.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/jilerovofab.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/87881269269.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wupikewufomijivebidigufej.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/fagibujisiraban.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/62552622573.pdfIn PDF document text
    • http://tcihk.com/userfiles/rotis.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/37535366691.pdfIn PDF document text
    • http://sparkpro.lv/content/file/wipoluzulusiropedevas.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/gajikujonopewage.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210916_994B66B801A3C54B.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/657ca8714438a3245bb75ca1c6b3fffd/zixugosaw.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/82817779802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=my+hero+academia+full+season+2PDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/54602323123.pdfIn PDF document text
    • 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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 21884 bytes
SHA-256: 18979adafc47d04c76350066917f1b4cbd57b7e9d56ff554158ff343eb069eb1
font_02_sfnt_off000120c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C4 10968 bytes
SHA-256: 4eae4fb3e96f51dcdff24d354936e646b4bc0aba04eda24e58516c7b18fe179e

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