Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce963116756f690…

MALICIOUS

PDF

78.9 KB Created: 2021-09-07 00:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40098417237cfc9cf160a19a0b18401a SHA-1: 949f67428a6c7bdf4cd3b1f3e3c84bf020a997e7 SHA-256: bce963116756f6903bcf831e8b2f457ab6a88b944971b76b45f820e15312e41d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://ambartakip.net/belgeler/file/zibevejowubimolovi.pdf In PDF document text
    • http://www.urbanwaterways.info/files/guzawokemogenopavedunofiv.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607349ebb2145---88676462688.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/weditisorotosubaba.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/46191169690.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bc61s3ln128698v4sfkmdk4dkn/24285507699.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/govezofetukox.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60dcfe2dc8---ludoba.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/3388257113.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/bn588j0jt6opihcij36qlcr9k4/vizeladi.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/votumuruperuzupovirita.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/bowuzosozanetalokumivud.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210830064836.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/vifuxowatomibozixulu.pdfIn PDF document text
    • https://12shio1.com/contents//files/sepakez.pdfIn PDF document text
    • http://marketingnews.fr/images/file/57779226044.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/11028775974.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/a2gj9gj7p91nvgaj22d6f1lt57/guniferukiwolufoje.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160947d71ad44d---komitaxovapabezeloku.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bb9ee3e---fopujugotuxaxe.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/7que26h6vau3o3okiu1siqa8dv/34826130116.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/rumakivew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fortuner+2016+manual+olxPDF 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_off0000cf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 10648 bytes
SHA-256: 2182a9954cb69354f47a442598a744c7edb4c662bc8abf3f1f13584daefaa167
font_02_sfnt_off00010022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10022 17384 bytes
SHA-256: c507b45f0e2f8327e28f62e1cd0fdb21b6a1c6dbec9ed7d767aa3f0b1832c947

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