Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebcb6d216b02d8a…

MALICIOUS

PDF

69.6 KB Created: 2021-06-28 20:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7a34afb8644a7e1627c3dfe7c3db56be SHA-1: 7ead25a5e2ec70791370ca2101c235d58f1eb90b SHA-256: aebcb6d216b02d8a809fdd6ccc579aff51dfcd1291ac187a38204751b40971fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://adasms.fr/userfiles/file/juzugetefazafofajir.pdf In PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d06a5a89---96447928343.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160877ae878707---nagajat.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da6e4f343---pizojubabowojefosadi.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/54559659476.pdfIn PDF document text
    • http://recrute.fr/files/files/lakuwifa.pdfIn PDF document text
    • http://greenbrier101.com/userimages/gokifoluru.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/69449212609.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc745b2db7---dijenof.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/tusimeboravobuluruzo.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sogivivorenikivusozu.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/webegibosul.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/78011746466.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/80076b6b7e0ae947d54f1b710c6ac9a2/juzusibobixatipawetos.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c90f0b5c5e---77404578348.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/11788944500.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/pupalejikimifike.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/89429567052.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062005135719.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8140bed8---32395669150.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lewexixikonakal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+rally+car+everPDF 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_off0000b3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A2 15180 bytes
SHA-256: 16ec8c187600c1c2b8e578458261ec1c1b070560855c50af91ff4c54134a9cfb
font_01_sfnt_off0000da62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA62 10140 bytes
SHA-256: d0af4b05647d5fab362c71b45bb6e9fb1e2fc206be6a30c3795e77aed118aa55
font_02_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1