Malicious PDF — malware analysis report

Static analysis result for SHA-256 daecb7e153d80bb1…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 10:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39fdc0d349c6035aaf60768dfdf03e37 SHA-1: ca493cad9d2403184e168df6aeed12c8ff1561d5 SHA-256: daecb7e153d80bb1e2b5e7a2e9c4032ed365965fd5bfcaf5447ab040c7cd8aa0
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. 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 0.9837

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://medvor.ru/uplcv?utm_term=avengers+game+installing+new+content PDF link annotation
    • http://citysoupsbellevue.com/uploads/files/rivabapa.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fewunuraxateraw.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///44482409424.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/vugijibirejufezapefi.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/nidawelizejejumuzujonubo.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/nunedateruribumozuwi.pdfIn PDF document text
    • http://timebymtm.com/upload/files/15398996777.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/90267805043.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/larulanezug.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/fedepupusaros.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/75388983041.pdfIn PDF document text
    • http://tcihk.com/userfiles/39752009677.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3745bfca4---malasixat.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b0fcc424---gerujisiromiwurupuj.pdfIn PDF document text
    • http://envigest.cz/upload/file/39723826026.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161492c4c833a4---35837144088.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148776f0a8c8---wijegogezajapovotobusip.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/a0c383a0b0c40b4d972a2c1ea005be04.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/36551424270.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/sejawexavup.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/88635074110.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/5477086869.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/nixenim.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/31462802303.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/74983341734.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/15269759418.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/87355925376.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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 16388 bytes
SHA-256: 158e5ff91611c4e491743d86749411d58ea0e6a3f1d8f7054bfc3684bb67ad66
font_01_sfnt_off0000dc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 10704 bytes
SHA-256: e8414d442ca5024a9f7bc8a7b4571ffcf863fc6c7280487878e904a2ee176c75

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