Malicious PDF — malware analysis report

Static analysis result for SHA-256 2399e36ee8c75133…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 11:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d3dff147261722248d8d977292c6c8d SHA-1: 09cbf69496e5018c66296ae1e73e69003cbb465f SHA-256: 2399e36ee8c75133f1f412d9304e99a88ea8775c033118fe38df3746b5da3660
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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=padauk+font+download+for+android PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780b8ac9ae---12991996788.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/gexulitokesuburubavu.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/jufapamogodasu.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905064250.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0b0d8cf634672daeb92aa903df3c6dbc/ruxadol.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/lizumaxipusol.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/10665463263.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/todud.pdfIn PDF document text
    • https://inks.bg/userfiles/file/tebagebivuxez.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/5903109266144cbfc43020.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370f04ebe34---67915548302.pdfIn PDF document text
    • https://znalac.com/userfiles/file/23692325537.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/23455100148.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/62965720330.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/reteregozanujuvuladelokoz.pdfIn PDF document text
    • https://alev.az/userfiles/file/sodafupagewapafumikewim.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/wovitosunigojapofekewux.pdfIn PDF document text
    • https://phm.vn/upload/files/ruxuzubibexolibi.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/gonilesemudolafinulago.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/17403841002.pdfIn PDF document text
    • http://nscenter.cn/upload/files/58489992907.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/38520131423.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a88208dd98---43007622387.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6sq4u8139fgmkflrpl9sjudo96/19017371837.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_off0000d213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD213 21540 bytes
SHA-256: cb1938ed80bb7ebbeb11644bf8ef831f0e4d8a5d519d77cf3b4354eb6de99b36
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12284 10324 bytes
SHA-256: 098ad3d16bfcdbfcda56d10984c75a8802d13ae1405964754fd453cfaf92b553