Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a72459449485822…

MALICIOUS

PDF

84.8 KB Created: 2021-08-14 22:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12e41e1e6c54f5fe1a339d442bd74e6f SHA-1: 5cb41c6b1f8eb1e5dc529bc27922022b9fd5f908 SHA-256: 4a72459449485822793f5e263c7ba98e7f27aa4b0267732c8f6ff72cb5bf4cc8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. This suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://desushibar.com/userfiles/file/pawepizozeletized.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1d0ce21e8---nemajaziwunozeletoje.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1673435a75---13794520062.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1310627fa245ebc9cd6004026b378e86/14546573846.pdfIn PDF document text
    • https://ekransamara.ru/files/33143577718.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/wofenaxekubuz.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/78632785808.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/28760869300.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/vitugejetugopevexuk.pdfIn PDF document text
    • http://jkohut.pl/file/54770043459.pdfIn PDF document text
    • http://splogservice.ru/content/file/nomixezar.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-6/20210606155334664553.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609473921cfd9---38374609816.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160884df8ed899---62650014917.pdfIn PDF document text
    • http://dzbnf.com/upload/file///89397464908.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/peninowapudakumu.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/65440019722.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/tazifiv.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81be655392---64098263538.pdfIn PDF document text
    • https://andrejc.si/files/file/94697191286.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161042862631a1---33769591543.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/toladamitewav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=problemas+matematicos+segundo+grado+de+primaria+pdfPDF 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_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 11204 bytes
SHA-256: 059bd86d8ad8fe0dc19ee456e1467fe63348a507bd94c8e712cbb45cb81b7e36
font_01_sfnt_off0000fa68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 18416 bytes
SHA-256: 4b6267dd3fd0a6b8a4acfee34d22a1e2ed47b28d2f87f36f489eb6dab9894be1
font_02_sfnt_off000129f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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