Malicious PDF — malware analysis report

Static analysis result for SHA-256 83003be248b26d4a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-07 01:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae1444e014a2f714fc911e2a14ef9390 SHA-1: dc6aa1536516a2f4034891ce96ca578a13983623 SHA-256: 83003be248b26d4a4010abfe0936865c766f46ccdad62a4d129db7d094648a6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://irlanc.ru/uplcv?utm_term=writing+main+idea+and+supporting+details+worksheets PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/bd278b823478511b355d8f44beb80a08/zituditomiborane.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210811020847.pdfIn PDF document text
    • http://jfe.hk/userfiles/83554915641.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/dfbd43876ef6142e952835a41c6d86f6/sejigijuwitax.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///bumamovuduladawemu.pdfIn PDF document text
    • http://ghemassagenhatban.vn/Images_upload/files/86266941211.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/bulowogafutoferidamijamal.pdfIn PDF document text
    • http://chromavials.com/d/files/fudorupogetutovuvoju.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/060819317309.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/21011064275.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/93348835580.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/11223695739.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/24649805402.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/05uq5qca2v5nt2bduptvkuuhj7/demojixajulimewotewalet.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c199e743f3---21699831373.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/jebab.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e50b22165fa---74130705024.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-19-02-40-58-66.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/pafiduxudozigetimoga.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/pevuku.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160837f6ec6356---91268823175.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/38113671656.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210828063815056.pdfIn PDF document text
    • https://marosme.ro/hirek/file/beginepo.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_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 11112 bytes
SHA-256: c7ff6ac9bcf5783473afad4823283d765bbc676561895f117e55d878c1f2074c
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 17664 bytes
SHA-256: 0d537d02ef8dc004809d1a0837409170dc8cb49fad498fe0e4d626fad538a949

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