Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1099981d07d003d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 11:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d4f74a912d9934846caa1da9dd14fd3 SHA-1: 2d686ca0e3c0def720e1406cb767913ec94084fd SHA-256: d1099981d07d003deb157751937b449c93229cadd04ca44b06f4636c1614f277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and the nature of the links suggest an attempt to lure users to 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://everestart.com/images/stories/file/47430953111.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614053bbd465f---rapexunonuriwoxolunizu.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/pifigerapabeviwaj.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/fixenazetewatufevarogak.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cea6344dd56f90bff95b47508f769522/5718816514.pdfIn PDF document text
    • http://gabortech.com/admin/file/26433649128.pdfIn PDF document text
    • http://shopabrang.com/images/files/newofavezalotunutodolif.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/54302661851.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/2805311146.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/wigupa.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/tadegu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613058b7cb6e5---36624651343.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/85c83c04f78133570dd7a1ab5283da67/11417817073.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/botarevasozukakikuxebo.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/xojenexane.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/47484480488.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/88207670619.pdfIn PDF document text
    • http://liily.jp/upload/file/20210908043803.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/kusojawitulejave.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141150265a58---vefosotesemepumabapolijaw.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/55812421117.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/75337940323.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/034mb8crrm7jtnmtaktt51kg4s/jurisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+piano+pieces+of+all+timePDF 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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF67 10592 bytes
SHA-256: 2072c38086260c748b3ac7c7b6b096b5ce76313fd9cf87fd569482b1d4d4aed6
font_02_sfnt_off0001079e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 17356 bytes
SHA-256: bd2146357034a398149282933f203ff7da0832f749cc03b6301758b6cea6bb86