Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fa249ed31bc843…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 05:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dff6c80bf3e33f2c70a2194a18668bd4 SHA-1: 549ac61d552b47e626f6881003169ef024cb50a1 SHA-256: 66fa249ed31bc843dec77cb9eaf0ceb023150c166af5f585fbbf947126d08bcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate this PDF is part of a link farm, with many URLs pointing to compromised websites or disposable hosting, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://quatanggiabao.com/images/uploads/files/fujureguwudifu.pdf In PDF document text
    • http://www.miyadenthai.com/image/upload/File/wonobepefi.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/48157779062.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613151560809e---xavelufipilekirosa.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6f646790---zizenalaxupajijesixepi.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/31203147104.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cd45999dc480075260a06292ac445bf0/39245992674.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137ef619722e---16845823458.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/38280008760.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2bc214a2---73997233095.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/24244642680.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/kigizukekofobasatuwunepuk.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/94448765075.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/ninilibuwutubumisotetepet.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/vefupitinofefuneboge.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sagamolizefefu.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kujokojitijejabovutim.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/saterelop.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/78453263576.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/75178869383.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/17766897659.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/zibujulofileseteros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=official+mm2+value+listPDF 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_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 18000 bytes
SHA-256: ac1a56a48773ab73e3462c9087c6d3da7d6214b54a2897190cf5ca3a925c1f90
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 10484 bytes
SHA-256: 8c6f99ab61b81f8e2eba27dea8c2ffe7224ebc9e2a5edea896f4604525c6848e

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