Malicious PDF — malware analysis report

Static analysis result for SHA-256 8897dcd18b5f4229…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 01:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3563ac3b9e6844c8d9c188aef4d5006e SHA-1: f841b9d802617ccbb530be3049106fa5f04cdd06 SHA-256: 8897dcd18b5f42298f2d18eee66c53b6098ee4c2f92a99143a1d3a59e3d39847
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicate a link farm designed to redirect users to malicious content. The file's structure and the presence of external URI links suggest it is intended to facilitate phishing or malware distribution by directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=legends+of+chess PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a9a94619---sezibubunonuzoxa.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1622222833.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/e3daebbbdc8181c908f648bc2f8e8483/dujoju.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/64189318184.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/vizuzewop.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf35b07498---kuwexulanefole.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/q7oap19cqk1h7qu731tl6tl153/susudibepiwaregutukowod.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/f8be6381ed20b354ea8e18f4e6065db1/90363014818.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///latefujixovut.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/6575109535.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8c260aff1---guxosiwifadewigibopet.pdfIn PDF document text
    • http://pneusmarene.it/images/file/gabilefaxozemo.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/90322539547.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081857a1c180---pakamafizaturelidusu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7a6964f8867fbcfab0ad544a96c1061f/86068247159.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc02cc711---71067691616.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160884ae82925f---26730064540.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/beniduv.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/phbuulpc0hdepodh2ecqg4rbg1/mekuzololaxevatasubo.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/94001205732.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_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 10216 bytes
SHA-256: 89a2d190e40b4f889a260ed23d7a6d39f6ec6a088aef7e8f62c35f19e66add0f
font_01_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 16880 bytes
SHA-256: ab25e558115b965a9abbd8ef34742e7f5494d40b4f2b771056bd1056e3cbd001
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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