Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c05cfc9efebeef0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 03:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d243f816952b92a0b24ea522ec36c1d SHA-1: 30ef1c5ee6d1e477614be1af02007866c31a3de7 SHA-256: 6c05cfc9efebeef0f723a0426c00e30481137071e9a20eca9dea598c568d8e6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. Heuristics indicate the PDF acts as a link farm, directing users to compromised websites and disposable hosting, likely to facilitate phishing or malware downloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/75416291358.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136967d3c993---fomikukabaxeper.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9301cd973---71367010676.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/84916801910.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/81369600845.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/vuwetekisabamugonu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/62919854255.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/lofaralofunogojene.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/63266002123.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/kefoz.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/pakarimulo.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/lofonodasitebuj.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/sazikav.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/92357969671.pdfIn PDF document text
    • https://btegypt.com/file/4924864241.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/lazejimerodojenevo.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/73718508128.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/54424865790.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/70597593868.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613b55a5acae1---lugufitivivemafedirolaluz.pdfIn PDF document text
    • https://sim2007.com/files/46528598987.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/4111995400.pdfIn PDF document text
    • http://huntland.hu/upload/file/sorarosasolamun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=comment+cracker+une+tablette+samsungPDF 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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 10844 bytes
SHA-256: 3a184abbe6a2b5f19e4f77d61df222ff6cccf05a7e0f6c6e0cc8b813379f9d7d
font_01_sfnt_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 19504 bytes
SHA-256: 29bb1513c7b1cb901b8f3331331c42e0293eb200ba0e0df326dd1aff1c93104f
font_02_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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