Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c48681633c914b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 06:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b36c1d7aa44b5154c13ad3df28c5544b SHA-1: 96564ee6129be2fa19d407cb49c0e1c4b2731205 SHA-256: e8c48681633c914be84f38d3aba744cf9177e4b9af17871e41c44e57434bb90a
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0bac0101d---15754428824.pdf In PDF document text
    • http://matras-devison.ru/upload/file/levapipixexifafodoziba.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109140326129269.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/bipudenovan.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/titepovugibopukoriromajoj.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613db736a8e18---59455881334.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffae13ed1c---91767860047.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/11599225608.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/u47lhdcnipuq76j48ntefee1qo/94927122192.pdfIn PDF document text
    • http://strandedtattoo.net/file/wugefow.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/zufowadajowijo.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/buvimo.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/goliwivipiw.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/vevelaba.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/4109210436.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ee6b27bec548d6d8d4422de75ebb4147/wijunolosuxi.pdfIn PDF document text
    • https://stotex.rs/files/fapizelupu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5eb58602eeb371e2d0f957a737573292/dexajugomodoputepow.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/77667260132.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135aeefaffc8---71716699899.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210906140052.pdfIn PDF document text
    • http://uteambio.com/upload/files/xonitononazaxulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=standard+10+social+science+textbook+pdfPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/tixupuvelenuremapagiv.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_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 11196 bytes
SHA-256: 243677fe112eab9e70f8f6ad8f355d74cf1369dd7e42b440b0dd27083bde2d71
font_01_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 19680 bytes
SHA-256: e0ff044846010984fc35f0299b8f4a9efbdfc87e3b9039a91a120c93125cb4b1

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