Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac7cd45e5df621e…

MALICIOUS

PDF

94.9 KB Created: 2021-08-24 10:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf96404ccb92830d930fb13e738182b8 SHA-1: 0c2d9f07c284025d19230d5cd77b29647b80d418 SHA-256: cac7cd45e5df621e2aa042c30603d5bd586bceb1428686c5ee3c3710b5f8cc48
96 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. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://hart-metale.pl/gimnazjum/userfiles/file/vifabafepanulozavemo.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tb1h0tf1mm8l0n7ij430nma6jp/fovipugitepot.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/98071906513.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7be2870e---15057622842.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/48698592366.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095e87840d1b---rebapefomixoju.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/18050316041.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf875a8367b---letudatokamukogutinokusi.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/94432873171.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/23447127822.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/sorewoleno.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/37730276388.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a794905c904---55260304299.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/90687762069.pdfIn PDF document text
    • http://peoplefoster.com/pliki/17153348370.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/54916266528.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/wubufilewaxurumomiwivemi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/siwowaneximevevidaxazop.pdfIn PDF document text
    • http://yejida.com/userfiles/file/22180316659.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e1564942d---pilutapokobetasasilagiwib.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/90997548797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=black+history+coloring+pages+pdfPDF 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_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 11160 bytes
SHA-256: 94a1702ea7ff5ac668c7480d2c796e9e7ebed5eda7dcfb3609c255220c41fa6f
font_01_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001406f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406F 17220 bytes
SHA-256: c1c4b7fc271092f405939fbce8485c4d4b31b8a88b17d17efeaa5e56d200eca6