Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79dea4168e81a4d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 17:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e7e42d201a7cf1283c9deeae69235c8f SHA-1: 72acdab01a6e30e51d58c76b8be1468328d6b0f3 SHA-256: d79dea4168e81a4d63f5f40a8f0e409ba9641f864eb398e0ef24e43bbfacdab5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://catamma.ru/uplcv?utm_term=d%26d+tasha%27s+cauldron+pdf PDF link annotation
    • https://uroci-kursove.com/userfiles/file/69055120711.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/76080401599.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/7492592647.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e80feefd3dda748df8837979fb26951b/76641180320.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/86867524033.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/18453876076.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/fenupofenosi.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/52582804857.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/relunobifog.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/zisuzizoze.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/16508684407.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/7415753827.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/fomisojazavoxafezedifevo.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/zelenuvurenudusox.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f015a3ed25---71362061232.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/90984928319.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613419a4476f3---93347942861.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec901ea014---78846876297.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/28209997557.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad9070733---feroxujibet.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/wafediz.pdfIn PDF document text
    • https://egca.fr/userfiles/file/migizarudu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613348895903f---18018639701.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/pulifopelubanoziten.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/ludoxopagunokafidusa.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136370465839---segazusu.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/tititemizemeletojazar.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_off0000c996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 20616 bytes
SHA-256: c41b12ec0f82366fab62972b3fdd3a7ab34afce7322881649af2aba2a3a01312
font_02_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1