Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3c8b52e76cfec3…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 19:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: cf887a352489d7fadcd34e8d5ce789ae SHA-1: fb6d4a2eef37d9b07d93bb0fe1225329fd638e87 SHA-256: 8e3c8b52e76cfec3550f0843bb03ed9d532391b6d7932ead95fa14adeff23442
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the links indicate an attempt to lead users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://crewmak.ru/uplcv?utm_term=witcher+3+hearts+of+stone+gwent+cards PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hhrd44aep971von3rb1re6t1i7/tisexomamimagoxipikegobaw.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a892bc93159651c7e0470c49718c19c6/nogurima.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/85616188398.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/golofokosox.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/50872720893.pdfIn PDF document text
    • https://patc.fr/imagesfile/911264168.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/62816156726.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d764eedb8a0---61426820805.pdfIn PDF document text
    • http://mega.kz/media/upload/files/nobegofanoguxumafupim.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/70019892460.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/62778547348.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-1/20210601054111247008.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03389b868---73980479475.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716df7b8237---fesezufobufadubezajij.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/jubupexus.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4d1af879---52163354145.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e12989e58b13543af227f815165dd805/lajufojuteroxodujume.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9b7a98762dc3a79a9275882eed5f1965/23567755939.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/40079832962.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9b4a64881fead521b2143714ca838c97/dejoj.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xirokapasilixaduve.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/zonuzeb.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/541cc5aae3fa84ddeb73d3f4559eed87/tudive.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_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 17960 bytes
SHA-256: 89840166c469616d08674620fee3510b3648dbdcb893d25ef8970c9256a603f3
font_01_sfnt_off00011b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 10960 bytes
SHA-256: 44e7e0c8f4443e63754654786e1e7366f42cda7a1cf9b5c30fb280e967c62eaf
font_02_sfnt_off000134c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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