Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5cca0ba8f727b6d…

MALICIOUS

PDF

70.2 KB Created: 2021-06-14 00:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a68c77d5fd1b911ec543b2a816c92988 SHA-1: dcd4168f098caf1c8e722a0773af8998f5e0bcdb SHA-256: e5cca0ba8f727b6d86cf855c44cf09158c1bcceef6fd206bb60ad81b1796ecf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=download+broken+but+beautiful+season+1 PDF link annotation
    • https://nguyenthelong.net/userfiles/files/71525200439.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609497a2d472c---dijigiberebuzapavowori.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/sqffpkvpbvvtevkq8k4l2gsq4i/29861761713.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/xexaxurulebafuzomagurem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c678f34723f---90641722528.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0043c3f7---14732058219.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/13313043141.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f819c97892e0127b46d1d6287cadeeb4/sukagumokeg.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/morirolurifuvanimelixeti.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/ponifemajumowuk.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/19599419270.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea34a5f48---31669498367.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jo3mqre4ou2stgmabfdoa9d8d1/mukexipigurab.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/56614925832.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5300583b39dde4394c65790d75e7ade3/10914416749.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cf25d73bb---21314085278.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/joxonajonubijijuxoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 5248 bytes
SHA-256: 2e8ae5e5db9261565f56cb378cdceb71d3cdfedef35ff57ef082073f298df210
font_01_sfnt_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 10864 bytes
SHA-256: b77e1a6b21886a704f5d0700acdff4442e46a93aa35f99616214bc9afa2e5183