Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4232f3e66ebf770…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 08:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bc9fd11b888666ad7505324e919f516 SHA-1: 94604e5c1dcb9c97fe431f0a8934bc58e4127816 SHA-256: c4232f3e66ebf7700b7cb17725cbe9fa8c70e58076347268293f8b626c14416f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links further supports this, as they likely lead to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crysiq.ru/uplcv?utm_term=tspsc+group+1+syllabus+pdf PDF link annotation
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081632ba5585---sofokefirepoporuvabiwal.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612190f58e994---50463999139.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/30134231071.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/nifedipagas.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/dcd062fab95cc4575cd92ba8fc983acd/kagavitipud.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/62295012196.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/ladovusaludawoguruwex.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tcpk6pfug8an3mthlgm512vr26/mukiwetumenujax.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/nozakotu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611de8605d21e---jatugagubekuluripefizasas.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161007eb4043fd---poxupotivigatidu.pdfIn PDF document text
    • http://martonelektro.hu/files/file/fidugos.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b0bccc366787b566a4a8e53a5dd0be6d/7157723473.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780ed15df3b---21460193873.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/66312300566.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/bumejepa.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/lawinitewitogan.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2897e2ad---60051297888.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a55a70b7---bogasupimakigovimixadokap.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094b98fb04b2---9769130107.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c300029e426---90241502109.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/linugedoxurel.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/rupukufuf.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kefb6tgpcpj0t1v61rpif6jf40/zejelazedaberowel.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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 17864 bytes
SHA-256: 6310817615b4603dc8dd3ac3399a251c64f3ef2f443aee95d1d2874e4aead01f
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 10736 bytes
SHA-256: e8f52017901085a0932bef39640c58db719a251cd7e117c0694d621c341f9f92

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