Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ceee8709c86c8bc…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 20:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60b42685cfd69a625ddf633b8fba660f SHA-1: f251fef02464d3259c17896c8eb6ce56784afee9 SHA-256: 9ceee8709c86c8bc5c5e3cabfcffac5b002536ef83a3094b9b70d4082fc5d96a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from one of the numerous external URLs, many of which point to compromised WordPress sites, suggesting a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gst1nqb94rflnqe7g1rmftuoaq/xitimadogexetimutexo.pdf In PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/73005814377.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/50169793331.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0ea612d66b890bd21d021278f0a90538/99780697696.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/juwedepasebajizanedak.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/gigareporibuwituxebat.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607081fc7c69f---84363838932.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e527a9b0b---paxurejetuzuze.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3862df02ce---gaposaxarakosovixeget.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/71057797657.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/60679123785.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e14fd396a---lotubuvi.pdfIn PDF document text
    • http://esipro.be/userfiles/file/misajeg.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/govavafudawijawidagatoga.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/c47e3da33ee1b8ae307b5d2839bee0e0/89236777529.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c103bea455f---ginofuzo.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b3196ec2e---10032080258.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/62081587882.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/dodukerelebiravomot.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/99317671387.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/89316421605.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///95807657022.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57121176828.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/4brcm04nqrfik5d04otfksss7m/88252877448.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1629132520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=anything+you+want+derek+sivers+pdf+free+downloadPDF 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_off0000d671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD671 11216 bytes
SHA-256: 89660e151ad392d03b7d28fa34af347ca9354850ae34342f15e493346b4e9c53
font_01_sfnt_off0000f093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 18560 bytes
SHA-256: a2e333249cf9a639c67a75ab65a012fc828aaa65b4a2c65832e3b7449bbfb36f

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