Malicious PDF — malware analysis report

Static analysis result for SHA-256 5340910496ecc57a…

MALICIOUS

PDF

91.0 KB Created: 2021-09-08 07:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd88e658dc83edd46c22bf05eba55347 SHA-1: 00338cfd9f660d32743a399cbccd0ee96dc278af SHA-256: 5340910496ecc57a120b69229313df5b79f9e57fbc970bf39acb8cfbd7323c62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains an embedded JavaScript stream and functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=visual+foxpro+6.0+commands+and+functions+pdf PDF link annotation
    • https://dukra.sk/editor_uploads/files/waporebasilipimunolizo.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/46597814779.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/59297616938.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/23441117284.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724aa5eec86---zagapug.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1b56c626acf7a07a170cda1a8f2ad282/vuxogilivisetimupuxa.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa09046599---93521720049.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/98295353642.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/xaxufifobugipatu.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/biropedejuzolusozamabenek.pdfIn PDF document text
    • http://wamer.org/userfiles/file/64428114365.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/21303342168.pdfIn PDF document text
    • http://allycatering.com/userfiles/gujizirobusavik.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16070777841d57---wafikanojadib.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160809882afbaa---dosawukasup.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8124ca9f3---27964993216.pdfIn PDF document text
    • http://coffee33.ru/archive/file/92244382835.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/kobuzekujanikagojo.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/tokunoti.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5283ef70f---87402405998.pdfIn PDF document text
    • https://senfina.top/uploads/files/rodozenuvudifokosuzeriso.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/zajilugusutosula.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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A6 11176 bytes
SHA-256: 676150de60fab1f877c5c2b43dc0befe4a1f8155fc6e30325c0e4f4ac71c3554
font_02_sfnt_off00012bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCA 19228 bytes
SHA-256: 2d9b935358e7d83aa6f0a10c0ecb8c4814754c14a467e6085adfd9f8c6f55510

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