Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd6b219fcf1138a…

MALICIOUS

PDF

182.3 KB Created: 2021-06-26 13:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8ef581af5ccd6f30889e7c47bb401b57 SHA-1: 0a3f68d30c23fb22b0a5be506d36a820004510d3 SHA-256: cdd6b219fcf1138aa654b6f6e179d4b0b424bc355c7118793a84b04d59e79de2
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, and the heuristics identify it as a link farm on disposable hosting. While no scripts were extracted, the structure and embedded URLs suggest the document is designed to redirect users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/b21640e4b1bb6ddd9f4559f1d13086d5/66565768856.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608738a252043---49096964148.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/el0uild8ohvn9lavatqtjphkb5/pozisa.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/futepelizasifaw.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608db4c99bcb1---13310571407.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff1376f35---dodatimotaxagijevujufi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///mexiden.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf843bd84---sozad.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1822b288a47b6531bdd0b5a2539f02a3/49781939012.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8db380b705d0fc10c11d23bac6a71cc0/86845251381.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa30d9e50---kegusijak.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/muwujizefesekirokaziw.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c8ca0f7afa8d1e9f0f13e84351cfed87/10535911252.pdfIn PDF document text
    • https://bselink.com/userfiles/file/67359998578.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jc71412lfcctet329r0kocnp13/20155376343.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/26119161574.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4969986db5---nelulelilu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/7ff891ad4c34320714875717ab435d00/25817636209.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a4f3e2d413ef5d7c0bd24af859f60d0d/527167605.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/50843605634.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/96476997850.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/21898067790.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c74a81242dc---89965465741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=equivalent+circuit+of+ujtPDF 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_off000269a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x269A1 10584 bytes
SHA-256: 620286ca9c92cebcb7ff3b516947839b9e8cf42fec5d5453b21c42b8d4782e4b
font_01_sfnt_off000281df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x281DF 18372 bytes
SHA-256: b461480a73e1fd184127de6777022c3ae6095de18c95a79060d5c608566f10b6
font_02_sfnt_off0002b22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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