Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde97d59cb9e3f6c…

MALICIOUS

PDF

98.9 KB Created: 2021-08-16 19:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 622100ef15f014f2470b2c0f32e8a13a SHA-1: 419a5cafa39a765df74ace95e68ca2f87d85e214 SHA-256: dde97d59cb9e3f6c00038d30535bb6b84aad53f43f5bf1c9896ca5f65732be5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://irlanc.ru/uplcv?utm_term=fiche+technique+motoculteur+staub+pp2b PDF link annotation
    • http://sacoorhealth.pt/site/upload/file/pokuvonuwed.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/12860256213.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a708849c3---53943124787.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/30741860574.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/lojaviwudiferamaxaduk.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/21dda610eca01639489f18bbefaae9a1/85717824658.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/sowamamixufetetofe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c237bc67---rolizofimozexegamowa.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/nulizebetagi.pdfIn PDF document text
    • https://tavio.ru/files/file/65472665882.pdfIn PDF document text
    • http://contextuae.com/resimler/files/supifavakirapadi.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/jevokusuvilufarazoxifin.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/zumujuxizisakisexed.pdfIn PDF document text
    • http://gerocuki.hu/user/file/59031884878.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/tixavipuvasir.pdfIn PDF document text
    • http://kfbi.ru/content/file/putejewojurabilurad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfec736ea---fivekibujinugovamu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pg7fl6kl808i9ucrs4833k5q14/butomajovazafef.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/fibekajamivometufudazu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b208d00b39a---tonilarewobasokivuwipa.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0bd19be4f19ba5bf9889655e8949f736/kiwepuzasituluse.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/lewewepuropaxexevese.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d543e6988ab---jadizijade.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/detomagatemiwet.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/84612804866.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/36e0bc02a9f94fa394781a0a5da9ab39/65150376226.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_off00011afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 11124 bytes
SHA-256: 269219871fa61daa9fd4412bfe0a287e44ede3550255bc0e15d130b0de1b5396
font_01_sfnt_off00013486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13486 18028 bytes
SHA-256: e24711e162105ef22075fe2fd787a04649f63a4f3468a3123c8da560f74db410
font_02_sfnt_off0001628c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1