Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde0bb7fe5b0d51b…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 16:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39919549bf5e6686d2a4880d0f8f2a0a SHA-1: 792d15f474465291cdf8266168c674d47b0f5b5f SHA-256: fde0bb7fe5b0d51b6ff172511a2a9aff143f017f433169672795aa1dd76870a4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely used for SEO poisoning or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://elegune.net/files/galeria/files/85991624297.pdf In PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5df5ec6367adb84bfc165eaee7c9ba5f/xibozenipipax.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/bewumepa.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/kavejatarodi.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/69994637158.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/77102404848.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210905130210_338906590.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161434d4611748---47271606647.pdfIn PDF document text
    • https://derfo.info/resimler/files/9118580030.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/97404477401.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/66673602490.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/47620248762.pdfIn PDF document text
    • http://wjcopy.com/upload/files/20160046950.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/sevejejipuramilu.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/71648361167.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/diporapofuxorobegefe.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/7993246283.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614751a47cdee---88882335074.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/nimowijew.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/76914701882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=redmi+note+9+5g+romPDF 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_off0000aa05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA05 15704 bytes
SHA-256: a243199a28ad41f9af75b4ccd6b690fc9cd80fd9c82549606b98b3ec121eaddf
font_01_sfnt_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 10564 bytes
SHA-256: dc38496c472a539d876c7668bcc7bed53cdd387ac227394f8c3298c19cf76568

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