Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7b000451d60d58…

MALICIOUS

PDF

86.7 KB Created: 2021-08-13 17:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14d30b02718c008652c03bf321fefe8e SHA-1: 26048b756e1d5c821ed3250408b55d84eb035d6e SHA-256: 7f7b000451d60d5869502ad4f634d95663b15dad4659e02661ac5ef28b28965e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a62bb5197---27845821036.pdf In PDF document text
    • http://chatfieldfarms101.com/userimages/81758138658.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5f1bd277---50748013954.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bidepenageja.pdfIn PDF document text
    • http://raczcsalad.hu/files/92921752907.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/tenogaluse.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161139436b0021---21204610774.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161001e6bc5642---21399014098.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/70528779799.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8208032210.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/62915514864.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/96233228117.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/zivefem.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/50d86fe292de0cd0887a2fa694077496/21977464934.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/19821468935.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xadebefuwokaluwenefap.pdfIn PDF document text
    • https://isosklo.cz./uploads/22046935584.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/wezakilezizibafefewosamu.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210718041938.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0e6655a857e40f99a1fb61b23223c374/mononogugepufibaraw.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/87126591942.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846a6d4a144---lamimivokaxolufofav.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610092bc85710---13132254818.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/gorudozulixefosas.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/difowanoboxukagomodosom.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/u36ph2u9bn6v3hi2q227kdbpeb/zezajijufukid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+business+model+canvas+explainPDF 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_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 11080 bytes
SHA-256: f9e5104b9cda27045d68e84355e1a6d00f9e0ce0451bb23fdc1ad9e2a1388bff
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 17704 bytes
SHA-256: 0fb1c27ce995303b3ad05bf3411b44fe776291c2762c6e6e6cd54bf63e5fecb8

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