Malicious PDF — malware analysis report

Static analysis result for SHA-256 7639a0b1998fce84…

MALICIOUS

PDF

93.7 KB Created: 2021-07-18 04:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4fd98dafb18242386a12fc6cc8926124 SHA-1: c55b288d5a39b7dd4d49cd9ed046579f1b25f0c0 SHA-256: 7639a0b1998fce846db58d96342a97539d1026fd29f659491ec327f649521f66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and heuristic firings point towards the exploitation of user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://tenshinorchids.com/FCKeditor_upload/file/kojutenoteveg.pdf In PDF document text
    • http://grimastone.ru/files/41750081232.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/jaziwape.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/76215555363.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6ce00a9e3218a3f1441ea909b45a3017/36274019979.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/afbf54f47f3366b7a469dc4b499785a7/73075679454.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/60011184415.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/72085161398.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d669e152---sufot.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092e96a08e64---nimevukomasakesumow.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bc722f384---jekoximaruzenurexeno.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3aa181726f88ac10e32ddf91244f8af7/42644914102.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0acca6e8334f76c1275d8cd3d0ae183d/72999298681.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/jatipakebetoserodat.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/63385948729.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32a5b328c9---bidasojegemevusebulibagu.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9cb02c733---vexobuwexat.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/19878118601.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/xosup.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/40682292448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pack+it+up+meaningPDF 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_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 17056 bytes
SHA-256: ab168a00bbd548f9d28bcbfa8197cf8b4f964f0fa3faaff7ecdec4114be314bb
font_01_sfnt_off000139d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D0 10476 bytes
SHA-256: ffabd36a69fba28e973729a7ff3f78cfff5b85294d0c34d08585729a0f1bb16e
font_02_sfnt_off000151aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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