Malicious PDF — malware analysis report

Static analysis result for SHA-256 56433c63d752e477…

MALICIOUS

PDF

79.0 KB Created: 2021-09-02 03:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d91a4706a5a668f28c2ea7ac66db8e97 SHA-1: 0124f571684a0d8ce257441dcd00a5dbe56f18f0 SHA-256: 56433c63d752e477a78f29903d8d843bd3698b05b9975d79b8247ac191a45a01
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware delivery attempt, potentially using JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=mouse+trap+in+cupboard PDF link annotation
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4793d574f357b660612d22108e656ddb/28932014225.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160708c137c8c8---darupipixuzajupof.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/l3qgbc3quk9896pstt22k4nsrr/85871415442.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1968579007c8aa410d15a9ab6adbe5a0/zibirirumog.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/jazuzezekavup.pdfIn PDF document text
    • http://mousike.it/img_ins/files/71365278271.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/puvitowulobobukimevi.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/16349136670.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/moluzuz.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b1aeb90f84badd76a73e6c54220ff2be/vunazuzovuzupezotoluju.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/qu3v991r6ri7b1sblejdghpbqc/49548151494.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5cb9e877---tosivafogisivefemijurutu.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/dikope.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af97ee2ec8b---42894512859.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749972d0b46---54149019649.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16100f78a30877---10855651259.pdfIn PDF document text
    • http://candientuvibra.com/images/file/bevogaziditomu.pdfIn PDF document text
    • https://drsaman.com/files/83693893774.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/98841386308.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/romefogigofaxizunuba.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_off0000d19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AF 17120 bytes
SHA-256: e3c3c5bb94f4505c032a244bfcf11b345ec462b4445e326307ee4081753d65d6
font_02_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 10696 bytes
SHA-256: 04e79677844b2e66c04f2c36ac029378b82f96b2757bb15719d96dbd00d62c36

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