Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cf4113b083cbde…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 22:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 69df0cd2bb1043717454aa7e22c2980e SHA-1: 90b12908d18193db6c213febbebbcc73e7c995e3 SHA-256: 12cf4113b083cbde6ac1012a51143b455244a56eea33e9cfbafaf884644f9214
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous PDFs hosted on compromised CMS uploads, indicating an attempt to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bawwabatrizq.com/userfiles/file/waxod.pdf In PDF document text
    • http://agendatourvietnam.com/hinhanh/file/7111843733.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/67996701527.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e0fc6d1ba081534e76cd3bd8a7f85227/jesokazonisubazeteduz.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c56258a1827f595d1cb79f251b6e5be8/lawunigabofupagunino.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/50442102028.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/fugadodetavewixejes.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f284a686e63153b95825a70764535cbe/9074378530.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610bd58acface---kigikafuretevifuguxaninu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad7164a0a---makovuwumisazidunutezituk.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/52500650601.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/380f5d4193a05d977fafa6a361db3663/rilesifu.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/budedi.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/74977729075.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/8856829210.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/verubikukepel.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7eb5ac7c3f4bc760d63d6070604944be/ralajilewizojafoposogak.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cc99a65ef720f99fd19d5d21ddbc0406/futetopaz.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/disoruwobulixesile.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09b937473f---73109716355.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/do6uo5g10qatka010ehcg53e31/93674655617.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/5414422675.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/pajidezunidesupe.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb69dc540---gurirutefog.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/67e5187581364d2fa42885b12bb8f471/14346618363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=five+senses+worksheets+for+3rd+gradePDF 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_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 17748 bytes
SHA-256: a2ee2f9243fa48204a6c79332d6a9ffe31f1721ae2b3ba4b0681ebccaf881a52
font_01_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 10980 bytes
SHA-256: fc35f051cf33848e96db124cc85158e169f32e5f055ab6b58f66ec1ad20975c4