Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b63f5ff59988d7b…

MALICIOUS

PDF

103.3 KB Created: 2021-08-19 02:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b4bb1c2dd5cb90f13e2efd00671857fa SHA-1: 4e008fe36a98e79d09f1caf6980f2d686b594493 SHA-256: 9b63f5ff59988d7b4bbd7f41fdb62800461e97e45ccee1dec18c07a1d8a2d851
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/65dvbu48j01lrgi7vnso3bmupv/56367170254.pdf In PDF document text
    • http://qzgj.cn/upload/file/katorumetalegoxokoboxi.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/zegosuwi.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/95055532594.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a0271760979b244dd81af3ee4b137bb0/95411118918.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/55843209910.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e3110243f7edd970664e12e738b5dddc/61670818431.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/52931682630.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/sajaw.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/nakukoxosigivuseseba.pdfIn PDF document text
    • https://biocoils.com/img/file/pibedexubigifuwaxilif.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/66789531016.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2fa3986edd9ebb03051903b644369048/fasolotewebonuwu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747923a7a56---femunutitokav.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/160c9a69b32eeb8b7e929fafd3c14022/39010766226.pdfIn PDF document text
    • https://alutat.com/data/file/raridezu.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/vatozojimawime.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/738017282.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4749719e---63865930422.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609098a046c28---gipajo.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4b6bd7f8e811a7f10866fb5a807c7cc1/wolirapisevomaxebaz.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/nikotawonopesuserupizador.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/139d307e91a2137072af5fbae6b32d40/zubusuvuxufejelegi.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/10952011781.pdfIn PDF document text
    • https://digireg.cn/upload/nuzojifoxoxa.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/150d81bd47d6beb870c8fb163b539ee9/39963056006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=farewell+speech+by+outgoing+students+of+class+10+in+teluguPDF 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_off00012260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A77 11492 bytes
SHA-256: 4ca67e392c33e1d0b0731301df9070c37657df95d0e6aa8d90d7583158c482dd
font_02_sfnt_off00015544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15544 21448 bytes
SHA-256: 80dc4715fa8f952acd8ba0c0d5a8264ddb4b6c3a9d5e908021e3c35e6a877104

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