Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3c1fef39a5a6d1…

MALICIOUS

PDF

72.9 KB Created: 2021-06-24 15:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5a752ca5c5a58730e5971cd1c89078d9 SHA-1: 4b66a22f78e2b19c84358deac77cb5b72e99c480 SHA-256: 2d3c1fef39a5a6d1bf93981e9642228c9894d370bb99f739abfb42a932bf9cf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document body and extracted URLs indicate a lure for downloading cracked software, such as 'autocad 2019 cracked version download'. Several URLs point to compromised CMS upload directories, suggesting a pattern of hosting malicious files on vulnerable websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://sutinlawkrabi.com/ckfinder/userfiles/files/69511809392.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16078e59cebea8---fuxowetuli.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be6d2f7cd96---minomivunuforofuve.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e708c117b22eca0e653eeac7a7eefa50/kafexoxovazav.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/12148266165.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bufuzewal.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/5990629674.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/j2klur8935vdgiianbpsvr5i80/xipamajuziximixojiwedobo.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/59834939106.pdfIn PDF document text
    • http://shosholoza.de/file/bafiwil.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f801f2c8---4015008009.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/21379325776.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/xexusokowazokemipor.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/51997064777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=autocad+2019+cracked+version+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 5620 bytes
SHA-256: b5ef0cbb5ec3edcc3b5d52a823dd159b40fcb97c09e5153e6d8be4c2dc8399a2
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 23148 bytes
SHA-256: 87f7dc4ab4019d6490abdb74c902004a44036c39d203c22b29f99d3d4964c10a

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