Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca78ea2f42c011dc…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 03:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ba223c2b7256889ba5d76616699a0842 SHA-1: a56f5f20781f90a807345339fa165582674bfda6 SHA-256: ca78ea2f42c011dcb5721243fa7f690d21e71ec7a0ce6f0ad59a8d758df40cd6
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cosplay-expo.it/ckfinder/userfiles/files/73734702336.pdf In PDF document text
    • http://misosmile.com/upload/editor/files/nakogaganenoxosoluw.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/zotodobilotawowugex.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2a398609f35db9b781d5f1714eaa827b/xavireninasaponusobo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/78219860120.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/ziwalekapifamiximo.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/40436570206.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161488bf1ed42c---91366011137.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109161656012394.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/54373176999.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/40711546584.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/kutukakedu.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/nisejigepuvawevopux.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/laruwopowufiw.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090300115826.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/wewikepod.pdfIn PDF document text
    • http://wawa757.com/uploads/files/tegiv.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d206c1ece5---zunijexiboxagikaxozi.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/rivekapuwamexakurugagus.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/25bbd474b4e3238b2868af95e48d472c/59731878368.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/41532151888.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c5a2b260c---kedixaxezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=live+caption+chrome+offPDF 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_off0000b041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 15396 bytes
SHA-256: df4ba93390c5632329fcbd3dd20b26f474bd07bbd4e0fcee338c7b5fe94dd116
font_02_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 10556 bytes
SHA-256: fadeadffda113b6fed170357cbb82ea14532e49932165eed42db0b7f2ad0f53a

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