Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8d5cb1cad2952d…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 13:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8f93fd57bc20f2cdbc827e1f1806dae SHA-1: b74896f7b23bc543f4e2b782020dd75c1bf5bec7 SHA-256: fd8d5cb1cad2952dd594223028a8fc91176df934d708301fa27605aef9c15258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=brother+needtobreathe+piano+sheet+music+pdf PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rv5thtk2kcpfdjmcu4jmcp3635/69745269093.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/bojorijenubo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6c853b789b40533167ed50c7caba2c9a/lavanewetalasomen.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/konutodetozunutufev.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/91466686524.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/021aa7a5329c5c03f6e390aa167d4184/vigupitiwubemirosubi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d543502ec---wakafulut.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e5824a54ec7fa25d729bf8972ac49164/20600885558.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f2383361---rakadadi.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/dikixudoluligon.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/mirezapomejesisalawapu.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/88629369508.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/supofixizufisaze.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7404ba7242---fasuboragota.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f93339dca---wugovutogoposofogunad.pdfIn PDF document text
    • http://rc-modeller.se/images/file///98068619143.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1aa05e795c628df74a182017b92d7d2a/fumofekupekegaledopu.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/70254519614.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5fbf8e7d6---15669891496.pdfIn PDF document text
    • https://gilbertems.com/videos/file/nabuki.pdfIn PDF document text
    • https://premium-house.uz/images/file/92503163771.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/mowamapunusitebadosoj.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d732d1f406c---67333061810.pdfIn PDF document text
    • http://uco-kampen.com/media/files/kozekitobowosutawibure.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_off0000cea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA1 16688 bytes
SHA-256: 15aede1111fcf89fe99b8628dd7035f798a3c377427ab71c3f2849fd563a8b67
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 11132 bytes
SHA-256: aa77abca0bf10c2465a6b61a80b4bd26a9885c7709ac2ff82ad32c198071f82c
font_02_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1