Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bee6bdf66d60f5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 03:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82a53150452e063c9a9cdf8bdd66a6c7 SHA-1: 23e5d957a6986a164faaa12452cd08e1972c7920 SHA-256: 24bee6bdf66d60f5b03f9050a2bd8d8207d02401ec05edef7313b3fe03c9f738
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 URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://drafthe.ru/uplcv?utm_term=big+brother+live+feeds+free PDF link annotation
    • https://aksukartela.com/images_upload/files/2629259117.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/luluruzivu.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84f05f312---vafumuresu.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/31373155590.pdfIn PDF document text
    • http://aa-nusd.jp/22003692492.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c6ac4efb6---tijokutej.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/dodime.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a244666f6bf---rapazomeweximor.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/42262135996.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/wuveradagekitewagowawog.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/bujoram.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/fonoderaponumirafupagivar.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21d1801754---52131694052.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e769c7cdd4---ziwubelamoxefagozex.pdfIn PDF document text
    • http://keitbg.com/images/files/nidoz.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/vesapabile.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/tuseka.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/33476137705.pdfIn PDF document text
    • https://nadamasristorante.it/file/gatiremamevinixaw.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/87356863362.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/gemk42vllb3honf187s1hdr4h8/sedipezijadoligosaremow.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b6b668708bf4961bc8adf06c1b49fc5b/69084993526.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d02e627746---5985756540.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/36c2a3a69d21941e6cc484da686ec846/78575277422.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/83478040420.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/dixizikirarin.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_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 18468 bytes
SHA-256: 2624bb9c523b1f5ed91c92439c582bc33e0d5f4a3fdd222d047bfb87df7b2a4b
font_02_sfnt_off00011dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 10628 bytes
SHA-256: 8c4fef2f72623d86ccd2a97af104f5b221ab2ffdb9b3efccd710fc9c8629ad52

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