Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc3984383f9d9d9…

MALICIOUS

PDF

93.6 KB Created: 2021-09-08 10:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d28c3f8e603803a5f55bc852b6ca3708 SHA-1: 284e944b248ab8ac388e5be9651c0403fcd71a49 SHA-256: 8bc3984383f9d9d9d9cf53d624e9a6289dc374305d66dc17cf6a13d7dd8311fc
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=christmas+bible+study+pdf PDF link annotation
    • http://ecoaga.com/documentos/file/12775027372.pdfIn PDF document text
    • https://aspirans.com/files/file/zoser.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/3fa898a0eef089e246f7ac302c6f7591/nulamagomunanalosedugew.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ksl3m0d52mbj5t6oehn6t3t5n4/75808728971.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/48910912460.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9df27c4919a53c837dd067a2bdc52fda/peteti.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9e17adcfa---40904352850.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608002e3bbb26---68879254147.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/64453114819.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///kaluwozolamanizu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/38c9dop35jgum0j8nepvcc9jgn/34634522505.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/35295068987.pdfIn PDF document text
    • https://ancoraeducacion.com/images/sakenaguga.pdfIn PDF document text
    • http://myredm.ru/uploads/file/jawopodofedesa.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717f1eba75a---37094799067.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pichur2k0n2tkmcmkvah18ubjr/65624665098.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd36b3c824---bugefekape.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c1b1f76d80b82a0d20be2fe7299d7f0f/35310805713.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/19726064472.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/13278015615.pdfIn PDF document text
    • https://blokhol.com/upload/files/ruzinenozowizulagorodaxe.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/8bb48d39d63941ebc58140641e4a2b35/33835569822.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/55958362469.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/fijibosogow.pdfIn PDF document text
    • 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_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 10924 bytes
SHA-256: b1695ec36c7a2822191c688f7d2448fb98629668c78b1f58a6e7378abf54d96f
font_01_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 18188 bytes
SHA-256: db039b16ccabaaa7fb0a2e49f3e1846d331c3d1113a3e80c6b25134285bb0245
font_02_sfnt_off000150d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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