Malicious PDF — malware analysis report

Static analysis result for SHA-256 97386c5fd02c4ac1…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 07:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0423e45137cd29d1b248277f261cbc56 SHA-1: 7928230c65406564497be02ae852ebb0d974351f SHA-256: 97386c5fd02c4ac13b181ddaa87933e37e0c7a51464662a1c062fa4f309aa7c0
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to compromised WordPress sites, indicating a potential phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • 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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ou2q0kkfdbkchm9pe9o0laq41i/26821383210.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b5f56eb65---sopofowojizaboguxa.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/82034377483.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/pafezuweditiroj.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81cc58b91---zafifupotisesizixa.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/rivuxetebixi.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/34618184935.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/4568158118.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/6039627545.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/99464731811.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/bumavaniraborafora.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/mifuvefedozu.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/fujakuginodupijojud.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/99963885611.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088942aa0c72---mitimedo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/6392079293.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c05307c0---79546220988.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b59b321d7e2---degelajowowelewo.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/65564166161.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/19363175794.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/sp6ctggknbj7b8d64ka534hu62/bozen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=disparue+darcey+bell+pdfPDF 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_off0000b4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B7 16180 bytes
SHA-256: 6d457dd6bc059d61f6e37f5c69c713aa9c1d69672811ab54e5c36db5ae80f0fd
font_01_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 10648 bytes
SHA-256: 5d28e6ab984356b22b73bf9ee9791471e897a78999c863dbc2cb5a69ea2576ea
font_02_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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