Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3190ebf07ab5f5f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 20:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 023adac4cdd42ea8071cef433c6f1cf9 SHA-1: 6cd5be4b053be80bffbc45d3bbd290c08449d659 SHA-256: e3190ebf07ab5f5fb7a35668f60bfb9dd376b557ad3577f7d0e5eaa5e0a50221
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing or trojan distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://tpdw.pl/userfiles/file/95411511545.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/313c7d9e650f09a55dfb2892552ca06a/sosutimetijajubo.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/54011753432.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/62170899555.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/be698f8c489d333ed9046643c9e43936/67004264421.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/tosafedonijudafo.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/57993008695.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/jixowov.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/67e1ea8049d22a4b3a7aa60339b5b6d2/83032913161.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/rudakifiwi.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/woveseritokikuxuwuvinuvus.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210914071607.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/14996385090.pdfIn PDF document text
    • https://la-klamm.org/Files/files/78266304009.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134e72c5feeb---36184910806.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/40636734301.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/kitevexero.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/41974654975.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/9080548427.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/noruja.pdfIn PDF document text
    • http://chamdure.com/DATA/files/voviralixipojugurilugosor.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/28218615948.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/66742340473.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/zaniwekopajawinala.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/93259549148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rogue+idle+rpgPDF 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_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 10180 bytes
SHA-256: c94cfd23c71aa5f27c31c2b1debdbf68777dfab19a63a0c1b0ed65a6fe7df1f7
font_02_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 18844 bytes
SHA-256: c453f07ad8f3a8bf2cdcdf620541c868125f65626dcf097928ce962549bd5d87

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