Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e6d33d4fbec6b9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 18:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 325d4235f1c8c8524b0b9177b07c36e1 SHA-1: 3a94af7fc5b9ba2396458e3360b4e36362876e24 SHA-256: e6e6d33d4fbec6b932c504fb02dfa0f1ddb13b0a9443d2a927a98f39157510f4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The heuristics 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggest the document is designed as a link farm, likely to direct users to malicious sites. The embedded URLs, although numerous, do not provide a clear second-stage payload, but their nature as link farms strongly implies a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.scsk12.org/policy/files/files/61432117775.pdf In PDF document text
    • http://sobateracota.ro/mm/file/62713129540.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/kezizipetusaxasonad.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/94518098804.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161466dd5c5ace---vepujipagurinotep.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/dojidumanizovomevar.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a119c5740---41227756867.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7515f46402b1c19dca5a13571da63b6f/makofunetodi.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/pajoturofoxetajifoxome.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/1745865675.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/rixuti.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/mugudibodigotexiziwisosi.pdfIn PDF document text
    • http://gibisch.info/files/files/53344390685.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/sufujibimi.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/4301863775.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/dabukojodupatonawotap.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/40184051840.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091605244432.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79ba2e74d---vipol.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/bajawezo.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/memobetekovalejapo.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/14810819539.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/66424786671.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/14200509396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=julia+kristeva+abjection+pdfPDF 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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F9 18848 bytes
SHA-256: 165032306fe70043c50d41a5d495255ab12ca6dac445a8676da2022b33de9484
font_02_sfnt_off00012873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 11132 bytes
SHA-256: 9132f4438e10560ebfa36aa549fbafa552cd3390e068a25f32a58f85cb5851b5