Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac2c6cc2970743c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 02:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da69a95f132456d611587a1849a8baa0 SHA-1: 8617f07156ad1b1619951b68058792ab23e1dff1 SHA-256: 2ac2c6cc2970743ca777eeda793bff9ae381ef11396864fc93870020194aa954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or link farms, suggesting a phishing or credential harvesting campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the conclusion that this PDF is part of a malicious infrastructure designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://drafthe.ru/uplcv?utm_term=grade+4+math+measuring+angles+worksheets PDF link annotation
    • http://roomyab.ir/basefile/roomyabir/files/tidinefawunolop.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/53772327993.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e9b927cbd170c726fcd5254966949bf6/tazapawepage.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a280049e3a---jebux.pdfIn PDF document text
    • http://clickvay.com/upload/files/tetanirojetibe.pdfIn PDF document text
    • https://ms01bet.net/contents//files/36901902054.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-9/20210809102850404220.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76894ce3d---72847349557.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fonijopinowem.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/jofobaz.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b283efee372---9312391119.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/sufikonuluxejemip.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qs83clsji9145q20ivsng9qqi4/luputuwenigakarani.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/07185442501.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09dcba9c3b---54434156633.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/13703476120.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/5496879065.pdfIn PDF document text
    • http://voijin.com/userfiles/files/kiwejusoxaxe.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/ruzafidexerow.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/supemivanusu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0lsieg051rdihc8udc2mi9j14c/80851931801.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/20d2f380e762846787650c130b31a6d4/22668626176.pdfIn PDF document text
    • https://viettrungson.com/media//Files/niguvifafawitotokij.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_off0000c1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 17344 bytes
SHA-256: e1e99dfb842289f8ee61357be63bfa6b68db10d2e3e0ddf443228c19a3a997b1
font_02_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 11092 bytes
SHA-256: 2b9223959e32f134371b0567f601ff4bd39cd42bb97b4993aaf653b4d00f9c2a

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