Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2a2e6abc6edd70…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 07:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a7325a6d59328058713ee2bf41091b97 SHA-1: 8c1b7b31e0c5bacdea32a1d2b63ceecc9ca4df4a SHA-256: ac2a2e6abc6edd7059e5bed91868157f4f1f1745282f287652ef2be8be37f554
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links on compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware delivery, aligning with the 'Pdf.Phishing.Trojan' detection. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

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 http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c63261545ad---26715523814.pdf In PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a48aa316a6b---96988313620.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/64984999543.pdfIn PDF document text
    • http://moorheadhigh1970.com/clients/c/c3/c3beaea4c2dff0dfe15f0c96d12524a1/File/muneverokuf.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/9675421934.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8488d4d2532f65aab440f72d8959ca7c/8996953848.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/9172806556.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021060410442480554.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb0e0d5b2---babagoxemikir.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/14465110938.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/zelanagika.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/22080106285.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea2a8bfe45---70166123956.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/lutinak.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/40859392721.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/55939231985.pdfIn PDF document text
    • http://capri.lt/userfiles/files/vamalavininavuzoj.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60d196698---latelarob.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/81030217c98bae28cbdb8d5a4a602993/lovadodujuzofigezoku.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cbe619733---62343675489.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1daa2d88c07d01ed4a25209402a3a9f5/xekazinexenebud.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608532fcec147---7219777026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+set+up+undisclosed+recipients+in+gmailPDF link annotation
    • http://medlab.webd.pl/upload/file/27804924423.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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 16680 bytes
SHA-256: e6c6a8c4062d8c829069435674c4b65960b29077b9fc05ffcc34931468076d16
font_01_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8D 11032 bytes
SHA-256: 003989002f88757b08d1bc3250b4258fd41b1e3886e61325659bfb8406430301