Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3dbbf46ab1780e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 00:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e67a835b6049e64920503b8d89248bc SHA-1: b4eace78ea09daf8f6b728a90cd420d2692a1275 SHA-256: 8e3dbbf46ab1780eafe7b7cb187334dc0cff27ca83bda5359062bfc582afb306
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.nitdgp.ac.in/uploads/userfiles/files/87301278300.pdf In PDF document text
    • http://otpetye.com/images/shared/file/bipenusiji.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/zamidugi.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f786dabc0c---pupisutigemumop.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/82170527087.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/88976131271.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/jotogizagimamojijotivi.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/17499444895.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/41123099377.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161344b9fef8e2---lotepinodig.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/vuluxafupenetimobupajud.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/xiwevuxuzodevavebirosi.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/xaxupasax.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614129867e6f5---75374235001.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109050735302279.pdfIn PDF document text
    • http://juentai.com/userfiles/files/83509466863.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/xovitevasinubizosojikebip.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8767ab924e9a13caf642f63a6bf60a08/nesabiberili.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138730422827---vuroduwexemilup.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/finufutiv.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/tadawimo.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/limusupajavufajifitegesuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+get+paid+games+for+free+on+androidPDF 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_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 17632 bytes
SHA-256: 8a56afcd67578df642eee89a973ef26a16c6ccf4bc81046fb1104656d524cdf0
font_01_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 10872 bytes
SHA-256: 65f371a4dc4fa3167de961cff097079a2395abd29c9a9d0e5e2745461bd6624a

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