Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39c21e6025fdec7…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 03:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e82a1e5d1ed7e3d0b63c12d0e0a5284b SHA-1: 6ce3fe6ec3dca69715d60e2c8487c145332157f9 SHA-256: f39c21e6025fdec77897650cd80c16bb3794b59d83dd7df94d3fe48b4b5c941a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jungleflightchiangmai.com/Uploads/files/maxenekajamolasipowatodov.pdf In PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/wemonol.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f69969d24---bejepepelakane.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/buwepagu.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/totalaxizubasigov.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133339e4e0e2---resif.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210922231308_82wnxn.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c612da19---galefepifegejapuzebikepo.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/nozav.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/tafopokuvufovedumisab.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/tuwibonafit.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/50302144563.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/25154401947.pdfIn PDF document text
    • http://rs-entp.com/upload/file/nifufejujezisugoxatar.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b25ceb6896077d720fb8b3cb2b2aadcf/99004236606.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109161019173905.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109111904243214.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614573de2d377---5560247058.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f2942010f24a976c73df1e62275afebf/vadelefixipo.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///52982232234.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/sijobegofizefuxonubo.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/18387219268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=xapk+installer+app+not+installedPDF 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_off0000af41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF41 10484 bytes
SHA-256: 4f0ac0b7da11fe0e57f5207b6347ae7f9974b2097161f9aa7e92d58151869c5f
font_01_sfnt_off0000c730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC730 16316 bytes
SHA-256: 2d5ca60e08b66f77a6d9faa879ed8c2f3e489821faa48f01bcd550806718fd11
font_02_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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