Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca70ac1ddc8ca89…

MALICIOUS

PDF

89.4 KB Created: 2021-07-06 11:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 521f77b92da91258d1e3f3abde0003bc SHA-1: 138c6c1632049cbeeee8ee50506a14b8794c6cf2 SHA-256: 3ca70ac1ddc8ca894677d5785ca3e879368fbcb751bd8e32e5f1275b370ccce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://cohensevents.com/clients/74638/File/fipatimebiveno.pdf In PDF document text
    • https://toskov-yordanov.com/userfiles/file/656142808.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b91914d70---5589800654.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f2564fcd---5891412639.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/43826057817.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/4avai5lkdeu4o42fid4m7ucnr3/31063530585.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160af6edf8ef20---sajanaduwixiviloz.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/11505810594.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca69de1a37---daligodikugaxipalaz.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c4687d9f1e9---14308789969.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/073938b5f2c48576c94aa8389c600d30/67037395723.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/23693991215.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d80e9cfd---vosudakok.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/jikidex.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/amskiouqop3ro47att3ptu8sdt/rikoramutuduwe.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/wujupofogujitiri.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/kowuribope.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ppvvvkl091u83c3m9310afae11/49275995411.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rkurnjor8ittiibdn7ij8cbbvt/26689552471.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d642488614a---rugukopaxikuti.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/090vcbeh0morcli1si7p2bctn2/vusaf.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f831b40263---64913740803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=terry+goodkind+wizard%27s+rules+listPDF 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_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 16936 bytes
SHA-256: 946b88c5350e94117c6b855edd2768d64fb6eae1ad3e1e78155df0ae70fc691c
font_01_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 10872 bytes
SHA-256: 4f710da7a8dd0699fb739ec5d7f157eca17639c262681e97fcc79c925caffd77
font_02_sfnt_off0001406f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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