Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0402154f6915e5b…

MALICIOUS

PDF

95.1 KB Created: 2021-06-28 03:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebe12a25c9b7f7964398d641a6be7f92 SHA-1: e48774ff25e1a8944f148b9818d42c35f29b7d3d SHA-256: c0402154f6915e5b72a6cb1fc31be7cc92bc744226d41bb6f9455bb905e3376e
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple URLs hosted on compromised WordPress sites. The embedded URLs suggest an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/4cd65a061703990a5b8326d0a2f7df31/fizazanibegulipijula.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/49252668457.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ca6f2d298---19697918164.pdf
    • http://hasici-pristroje-eshop.cz/files/file/48611844240.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d442056e94---94164351255.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed7ecd0055---99856183027.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607eada491ea1---67976841586.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fa5f3af9f62c8535bf855dcb6d3cabc8/68893616627.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/xunudubebad.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9c8d308ee---40749111365.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/rrls21v3p2s8ghmhhn0kc8og5n/83931406183.pdf
    • http://grafiport.com/userfiles/file/jadabibagafudimudojedekev.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0e4ce84b914bcb9cbf2bc050c0e1c22d/segotapofoxezorixabup.pdf
    • http://vervesimuhub.com/userfiles/file/8193787672.pdf
    • http://maychamsocda.vn/images/userfiles/file/34477322804.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/d64e75e41b3d13251df04f09ca2d55d5/xagaw.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3f7kk51u2r3aqissvleakt7ofs/53402203219.pdf
    • http://erbaytag.com/resimler/files/dejiselureg.pdf
    • https://baobihungphu.com/media/ftp/file/25936743236.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/dc219e986ce10340102b9c1ae3073a22/56170575482.pdf
    • http://renovator.cz/files/file/navenajurixokebudutiti.pdf
    • http://ankurgroups.com/userfiles/file/76219249561.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=discuss+synonyms+in+english
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fac.bin
301c1ce5d9235c684535c2f8d54e47fec5f6b5d217efcb92ce0e13f9d644fa6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 10532 bytes
font_01_sfnt_off00012774.bin
c30c7952445a3ac602f4c613b4326b65015f610a61314e2a42a43eedcfd0ddce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12774 17488 bytes
font_02_sfnt_off00015579.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15579 16792 bytes