Malicious PDF — malware analysis report

Static analysis result for SHA-256 2368a4910ea763f4…

MALICIOUS

PDF

75.7 KB Created: 2021-10-03 02:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 391e5f6e5af3d0c07df96f0efb3df3a5 SHA-1: 7fbf93e4351d9a9c65bd87d0af6c183943abde4f SHA-256: 2368a4910ea763f4b7951d2392e39701ab41eee5fadd65b2be5aef668868cd75
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://shiokuda2.com/contents/files/gitodufeni.pdf In PDF document text
    • http://thecargonepal.com/userfiles/file/sobenivodepa.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/72828677423.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/jimemegizubepofe.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/rogemomofukubig.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/79982403368.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/zeminujorosake.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/58893693317.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/rologosugorimomedub.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/wutiguwosoremezatiw.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/83420014898.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/xazewefozamexevowifawevu.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/fubatanapevemubalupufujab.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149162b4e270---vumusopuzosunegomijufuse.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/29803155210.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/9527585146.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/zaxipogu.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea54d9a94---92723107990.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/ripuniwoxekeba.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f212ba3b246cf2cc365364ca84c84ae1/pefenikefivuz.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/gebebutonubopi.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109140050158364.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139175006476---wisekozewaruje.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/nofaniximodanilatudodob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=a+sound+of+thunder+book+reviewPDF 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_off0000c042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD854 18768 bytes
SHA-256: a941086b0a858d58744be399c7fa331d3e0ae6d370716def6c330352f04c2e4a
font_02_sfnt_off0001089c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 10708 bytes
SHA-256: 831b75c45a5cd889f5447cfaacaf9648d294d15ddc636d24d64611a7247ef197

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