Malicious PDF — malware analysis report

Static analysis result for SHA-256 5264c7339c8e546d…

MALICIOUS

PDF

91.2 KB Created: 2021-09-09 14:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43ed526fc3f42eb8a1f9b3673a243585 SHA-1: f02bc8a8c4f8880be710e33967610c3ad58ae0ad SHA-256: 5264c7339c8e546deac849848b476a54b3a5d194d86f35b35f1bcb762650643d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://duocthientam.com/uploads/ckfinder/files/vegoxopaxe.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3696b2d7e534b636378399ba50c1f111/dizipifasosegagaxefajatel.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/jevapopamilixik.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/xaganipemeletiwikapijoxa.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/74119590757.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/pafilox.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/49404705390.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/49033226660.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/dedujunuximimowap.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307965a1b1a---45843909269.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161361f958f003---lekujiregegoweta.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210906175247.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/wekemodelalunisejuvilus.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75136914186.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/fumegudasimevigegumadekov.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613815254685d---sanelunukimunemute.pdfIn PDF document text
    • https://gilbertems.com/videos/file/mabimewesawumigav.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/42082443708.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/kosuwamojadonid.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/18879951497.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/jojedipifezokibu.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/pativ.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///35507623500.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/rozuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nobody+2021+full+movie+download+720pPDF 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_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 18892 bytes
SHA-256: 31516fdf62038d2cbf044c879d9ea97cf0cc5c6593a977b8c33bf66cefb4a853
font_01_sfnt_off00012cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001450a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450A 11120 bytes
SHA-256: c1df48a986c45785c2aceffb0a71e85179bb369afe3c5e3ff4c70e92bc27173b

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