Malicious PDF — malware analysis report

Static analysis result for SHA-256 565b4fc76b0df8a4…

MALICIOUS

PDF

84.1 KB Created: 2021-07-14 02:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dce73ab311a53d502eaad9fafbc45f35 SHA-1: 8f1beb9ae677e47daed9f9e09af9afad11ed1912 SHA-256: 565b4fc76b0df8a444872f5fe7e54ed2563d597068ee95dd2842b0387219ea70
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. Static analysis revealed numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort for SEO poisoning or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=the+local+eatery+and+drinking+hole PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bt9nrn78vt3ttt88vodvdkdl5h/1864966389.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/8btnersapk8flcv3sr24o1kag3/2807129213.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/v8lt6a2r3qtku7cgm99lpkud11/subosuna.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/belowuzeli.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160930734f0eb8---wasogogivetegitenarobe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8d94cf8ff---winoravivedekajakefexowif.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5cb0bf1b216bcbfef8be079bf029fa5b/pisatu.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/berupejubajuguguf.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/59268601181.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/23157479082.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/8d3f5c9333c5a78c07d9e2bd8bca6319/govupomivifubitefa.pdfIn PDF document text
    • https://webmenuplus.com/images/file/35181317110.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce562d7350---dipebojebev.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086d6639f1ad---62084538487.pdfIn PDF document text
    • https://combrooncom.com/contents//files/duvixisosixoli.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/zomobosozasiduwi.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105052114183506.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/15917871095.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051006574239.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/55965204158.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/bebivekuwemu.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/0a50dd83818a03b1bc0017147e0ef6cb/zegogibizakixu.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/21999331551.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/722db96dd64f08181448977d310b5fa6/2081620822.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/68949039504.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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 17808 bytes
SHA-256: 40932b13ef39b61cd6ca864434329ee0419d7b6ab154a2a4d906bf2803b29f9e
font_01_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 10648 bytes
SHA-256: 90b44261b1a4c88640fc139499229f28bccd072f6b2d06084e6aca1ef3333fa7
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1