Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff802e42ff436e0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 17:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d39fc429f4d699bab41137a6559cd12 SHA-1: 8c596eae8f6ea2d8dd445c1c67f2cfd545d45146 SHA-256: 4ff802e42ff436e034c05ebfa143869006f346dcafeded33629ea93226432c77
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lead users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://gfzgt.ch/upload/file/60820343032.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/oqih6p2074b9o7u00fofhvonm6/mafajojedudere.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/vitosasileloxojalonaduk.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/10129961372.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/nogipasawodomegi.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/34303591848.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806b7645171---guzeruxenoxibetagalamaxu.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/geturel.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/2549438268.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160905a608153e---gibowedowekusuwugujumulak.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/kogofabuluvomiva.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/92303367802.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/2352236631.pdfIn PDF document text
    • https://bak.vn/upload/files/99228533725.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/20647976044.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1627131205915768901.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b931e058c---tofuguteworikoxejekuke.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/apbq1f5out8l2e12j0qlllfkec/36953882707.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/41336897766.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/tavakarekogolatezoso.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/10555649412.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607708c7718b8---90526450122.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/93046861082.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/lunlrroh617er02rd4cf46edtj/75445138812.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/43459059382.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rmspt2ut1883k0at60fflmsjgr/jekusekekikigilogimeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=structured+products+handbook+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_off0000be8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16176 bytes
SHA-256: 82def87c03cb33557d1987ab18447e7c29fc58e2e1ce32ec810d841dd62fcf1b
font_02_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 10988 bytes
SHA-256: f62d37b89001d98c56a0ad0eb7a9fd5218d68f288d9655b369dfe1f822de3ea2

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