Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d63a51568dce3e7…

MALICIOUS

PDF

76.4 KB Created: 2021-09-17 00:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b0dde6f3d6d12c62525fa2060c4ba26 SHA-1: 4f09c8c34b45696e20bc1d92066fac5cfa265b1d SHA-256: 0d63a51568dce3e7b8bb6cff1a18a6d0aa69512f8dcea0a32cf7ada13d402653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614170a947495---vobopigiseripev.pdf In PDF document text
    • http://nghieuphong.com/upload/files/49980780290.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/86767353390.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/42108215201.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/98552875278.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/xonala.pdfIn PDF document text
    • https://almavilag.hu/files/files/51515321776.pdfIn PDF document text
    • http://yanartextil.com/firma/files/joxasalikimulusiw.pdfIn PDF document text
    • http://deauville.ru/files/file/64405664522.pdfIn PDF document text
    • http://freetds.net/userfiles/file/6192950783.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/desofuwav.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/timetuxutime.pdfIn PDF document text
    • http://calisnt.com/uploads/files/69777025636.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/13790216870.pdfIn PDF document text
    • http://schokobrunnen.com/idata/49435348786.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/16009919530.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/xebinig.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/sebik.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/gexaneduminifixozam.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/27710123561.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/026c9efc16da276dded21d3724a066e6/42140800789.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/23292509391.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425b57ce12c---90420942726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ifontmaker+apk+for+androidPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b41f38ee6---22908755909.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_off0000c585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 10488 bytes
SHA-256: b2bd1007a3256de9efeb1cf237224efbec6a12d77f4cb19ca5f082fe5155767b
font_01_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 18044 bytes
SHA-256: fa2ade44ffc1c93d64fa37c39cd2cb437f54161e4273abb5cc1962bb9fc2d1ba
font_02_sfnt_off00010bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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