Malicious PDF — malware analysis report

Static analysis result for SHA-256 348d882149bf9223…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 07:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eff89020a265e308c305670d5b1b752d SHA-1: 6c48ef9c4d0b2b0ccca03357bda05a7a293c46b1 SHA-256: 348d882149bf9223ebf616e775b580eddff8a4c3f9decf27563404f2695da9cd
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links on disposable hosting suggests an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://philabc.ru/uplcv?utm_term=team+building+games+outdoor+pdf PDF link annotation
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/2ca17cdc731971e51d9a1519d49c79be/bupigimurun.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/letokin.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/mutesodimafavamoror.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202108251930027181.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/vegibagusi.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/64095400736.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d01ba6521---fotejowigano.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/21367688291.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/92194198154.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/97959454573.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ac1b3e44978d688a0aba50cf65bc5998/dejorupisax.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16113e56887ff0---zosusuvuguvawezuxuzimoba.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/142d17fed6c6bbe345959fed79763155/20856764929.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/pipusepujademezubifasus.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161004c8645234---fizota.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/55664654780.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/vatevipakelikiwava.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea78181116---vasemogowafuboz.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/zoturajurulodomox.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9b141f89---lodizibetologitogiloke.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7e03688c---82868912185.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/motusemanefidafaxesov.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_off0000e23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 11044 bytes
SHA-256: 20426806b3211ca07a2eb1ba6a383aabf9b3c73d567649e0bade87108aaa2e19
font_02_sfnt_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 17652 bytes
SHA-256: 3bb9cb6dfbe2bc56a47c217df6e12ff55f14e44b22081469b4d9f133ae14fdb2

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