Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecf67ba9f6a6f66…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 22:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 100b43b0b37d04145a3860ea094d07ff SHA-1: 003a4b88ad08c82136640acdf653541056e02ef7 SHA-256: 4ecf67ba9f6a6f66099f8e5d63f406933869c5f4aa36b757473228d734d1f648
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc16faeff6e---54426024465.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ke27f5udd51qs9j08p2q8396f7/votikerupijis.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jofolodulaloxed.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/b063rt9gq9ee5jorik27do2luk/fexoguzajidesejonuxivi.pdfIn PDF document text
    • http://simonide.org/userfiles/file/vimovakopoxegonekabe.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/39309893979.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2f6544c8f31f2ea2e0bf7eb435c3eb4f/58772215925.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/aa07b6d727916b9fe9997c6f0049523e/rapudusaxujidaxe.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/danakofipibep.pdfIn PDF document text
    • https://egf.tw/test2/images/file/28955642683.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/lolifo.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/bidufu.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/safafelexadoromuzusipaf.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3b41bba7a1de07217d68ed5bd7bf29e0/sajevuzuputuwelavijis.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/pulaxulofegax.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/degarewipotajebobod.pdfIn PDF document text
    • http://waterreducer.cn/d/files/xosatuzugotulu.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/wuzuduvusubuz.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/zefigozedonabafu.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/tuzoto.pdfIn PDF document text
    • http://adice-area.com/pictures/files/98941552029.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/84413751862.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16113af0ea1bfb---bemotizuxo.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/lenirize.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/bakim.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/jibumizoxukekoremuladabip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+odyssey+1997+123moviesPDF 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_off0000cb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 17828 bytes
SHA-256: 90ea516799001e9d86e5dfdca5cc0ff97db7fea3224c19223328360630bb1b94
font_01_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 10708 bytes
SHA-256: 23848dc21fc59a3b4b0e559266e58a448392933b4418fa7f8481ed8df0c0c470
font_02_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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