Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93ff8144b901b2e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 02:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6a82bea17aeb0a5ddd952f7c204e9f4 SHA-1: 3f2bcafff8d9cd2334e34f98c332d5fbd7fe1228 SHA-256: c93ff8144b901b2ec1c96a946fb079169ec6e47f438124ad69c996eb1efc4865
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. These links are likely used to lure users to phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ej1isjsb37kob223vcovhmtm60/84677386529.pdf In PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/98929791135.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/sixofisojonuxuladotela.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/zolaguvofupuf.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/61100825621.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cnknq2qfjk9c1oklg3i5uate3a/52573631194.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/61941319120.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/xobibisuwimasix.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f9f03a5e0---wikawipidulijujipix.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/24718089447.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33cd8814e---7754969715.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ru7qtv36b1t4l7jmt9ahs4d062/64625896653.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e9cf070c637214f571601ae729ec1661/74187826260.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/426945813.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/gemumonevifugaposi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e75409bf---poluroduzanowumakotemavo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae724039f---finix.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/26243467891.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/79290975128.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608990cd8ab8e---warusejavugi.pdfIn PDF document text
    • https://anfauglir.com/images/file/lexewesivugujor.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/12936160952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=insert+watermark+in+pdf+foxitPDF 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_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 10844 bytes
SHA-256: c20efd3dccecf89e616341db35c3702d94963026dab4872087398e7f3024e0c8
font_01_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 18560 bytes
SHA-256: d95678dcde20edacfa4ab907e802ef26c7d8ee57e38e7585adeb03e40d382f7a
font_02_sfnt_off00012f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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