Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27fc2be425f8dc0…

MALICIOUS

PDF

87.2 KB Created: 2021-09-02 15:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20ad975e8c9106608b9472ea4ff8dc16 SHA-1: 80938b98f43fe320dab7b004763882c329709c08 SHA-256: a27fc2be425f8dc03e9dbd910186ba6149f665f8af91a2beda51e32de3f4f666
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on compromised WordPress sites and disposable domains. This suggests the document is part of a phishing campaign or a distribution mechanism for further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=defensive+end+drills+pdf PDF link annotation
    • http://maidichike.com/upload/files/dajawo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b29e6afd82---mogafopamazubefuludaxelud.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/didejopevijajawabifuwi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607421eab37d8---70422665699.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///wozexojewunezerarujip.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/32467468965.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/fibubevogusaparixutabal.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/roruwedeweporemotinam.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e70a6c9f57899c35c34b0c5787da6bfd/wuwojemupabowirawubiz.pdfIn PDF document text
    • https://filetorme.com/upload/files/38212354130.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3ba7b8fc---98047281585.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/odftd2c7u2kjj69jb9954ukb3m/6783460934.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec32e38a4---fezarapus.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/suwex.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//51743912651.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a0c7ca91af---55947579551.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/kuxekotulojikabib.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/98400414494.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071daf7cf285---dimogipokobiwusabedita.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/24359709354.pdfIn PDF document text
    • https://ikima.fr/uploads/file/29452540092.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/zazide.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609875dd92439---vezel.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_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 18600 bytes
SHA-256: 8293e3711b12eb0bcf2ee4c443f6cfde24892feed96f30e9041498c33e6673d6
font_01_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10176 bytes
SHA-256: 7d5ab567887b266dfbca8d8831f99c5e2386534926171191ae852e7ee186910d
font_02_sfnt_off00013733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1