Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf6207ca642a5a3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 17:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10ece95fe8ca159ca5f0efdbacd8a603 SHA-1: c09e53e8b890fa3a5c65be306bde808bd687dfcb SHA-256: 9bf6207ca642a5a380ed9b4e4dea9116c3cb2739bc22610dce1b8469684483c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. These links likely serve as lures for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://tsrmmessina.it/userfiles/files/vawenuzav.pdf In PDF document text
    • http://veszpremkosar.hu/_user/file/70179761359.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614478e901055---39632477486.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/91927835095.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/jemuviziti.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/gobegaxezowepuwidesetaw.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/biwejufideki.pdfIn PDF document text
    • http://landpas.pl/upload/file/kibiluwuvanujarukuxik.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/74228791414.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/navudijo.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/15190464688.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/dusufasasipize.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/vagazitonejenibo.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/tiperolufin.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/zizejozaretoremi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5ibojpae3tbcn8som4cdhpbb65/84286150213.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d4646fee---gumudepunowijiloz.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/jedijikofoji.pdfIn PDF document text
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/12076937211.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/wununopewamamoxodatezexid.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4c7c92358---zujeviwenozoxopazeviv.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161369810447b8---nozedeloxefexojuzenil.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/lazok.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/23567273560.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/7407398988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fire+liker+apk+download+instagramPDF 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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 17456 bytes
SHA-256: 900cf1fcfd375c6be6d979b8f64169b5823db7e748b0b980c75282e3d20706a2
font_02_sfnt_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 10892 bytes
SHA-256: e609a15938e45b4f1c1eface0412bcc224d3f32b248bca43ffe16ee45e7b9b2a

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