Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee3ebf0eb3a5b4e…

MALICIOUS

PDF

177.4 KB Created: 2021-08-02 11:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aaf2de722c5e02847f330780792d9c94 SHA-1: 48dffefa9f8933b340cc47e9ed7596bf562efe55 SHA-256: cee3ebf0eb3a5b4ee10b4c88ccf64e1508c1ab4b015a5c63e00dc26461c617f7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier also flagged this PDF as malicious. The primary attack pattern appears to be SEO poisoning or link farming, where the document serves as a gateway to malicious content hosted on numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8148

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=resumen+completo+de+hamlet+por+actos+y+escenas PDF link annotation
    • https://rachelrom.com/rescontent/file/zelotezi.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/vizolibasukijatidaxu.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/38329048492.pdfIn PDF document text
    • https://www.verimevzabavu.sk/ckfinder/userfiles/files/9016319764.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/nowegavaganif.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210704_075312.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c222384b6---wisiwajugiwedenonakefabot.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/zemiledubarimosixo.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/nobuziwusetixisemubu.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/51460132636.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/28562615998.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e991a1efe---sivikotupotejimaxitisis.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/xenofapuselafabusifut.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e6aba29f4949f393ba3393098b542272/wagomobosujus.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/494cc1b17dfd88e96bb453e0ff28eeda/98353240829.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/73334921023.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/29959068887.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160716e455f908---tudomopavexedaj.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/defulemuvapalokemagejawu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/718778d6eebd576f8ade90dbdbbb8328/jerupelagowos.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/baxobawakobamemigidew.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5cc344c3a---gimeroviredupurexipowisip.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/wipipobulixaluwasuj.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102964098c95---fuponopamovitikezuga.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5fup92m96kb52r4vcablq337ol/57482753236.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50816d6e6---vodulivolakavalukonazuni.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_off00024c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002643d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2643D 10948 bytes
SHA-256: ae00f317be3fc625f1265b6ea899cdbbd06f34abc4e3a1873103578ab0732ecc
font_02_sfnt_off00027d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D78 22792 bytes
SHA-256: ebf3d329210264fa24a0b5e4eac76ebb06edc420d81e51a6375378925cf17889

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