Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d63eefde0bc6525…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 08:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9eb8274cc017a7f6f57bfb18fd849089 SHA-1: 8d81dbffc43c5129d8feb434a5f695be74af72e4 SHA-256: 0d63eefde0bc65252c7a67c0b7cd5895bf5d2fab0eabae097d5ac2fc294d7021
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080cf9fa3bde---53014243587.pdf In PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bfe785a8e---nisifekuduburuxemotuxi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fe0a89b405262c59cb7ef73a438f6d35/sikidiwanupot.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/talerudofepizuvifomofibe.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/3582935963.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c6a60e3c8d449822ad429520e642bce3/zagaxu.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49060048321.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/9b3a72103290036dce1b775e8b9de2df/sajomepejafudewonowob.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/862d3cc28e05c3ccef3f687d942622da/83648176759.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/26da225927a5ba28a6fcf6467411138e/23071254551.pdfIn PDF document text
    • http://ipceurope.com/assets/file/ripekepukekabes.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/67818771682.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0abf06ebb---vudoriful.pdfIn PDF document text
    • http://dalaichau.com/files/897485178.pdfIn PDF document text
    • http://fitviewer.biz/files/file/79488360251.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/70269563009.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/gunuxaredenor.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fa35453b99823cd9097b020fe932a2d9/53431279790.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/75432089238.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16084295f19c03---94304354999.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1cebce6eb939e483ae7d107560c94575/17585072263.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/38659527049.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/lakikosajefese.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/96840052691.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/98305102773.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/zimalagujebafik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=top+gainers+tomorrowPDF 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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 15860 bytes
SHA-256: e6137609c276e2efa52df07e7a1aec7e14b08761820f5e63f7adfe8e5edbf8c5
font_02_sfnt_off00010601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10596 bytes
SHA-256: 69cf066e0133cb1b26cfa572ad207bb970eb19855f836e0b0c62e9ee2c2b7b10

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