Malicious PDF — malware analysis report

Static analysis result for SHA-256 8132e859281e5e12…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 01:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d4bb9631a7488abd8c25f1b0ed15761 SHA-1: 01bb6ef6dba4e0d7c4e1991686009e8558ab022e SHA-256: 8132e859281e5e1298451732f62e9bc1e9d74b7b559236ca11630f37be5240fe
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate that the PDF acts as a link farm, with many URLs pointing to potentially compromised or disposable hosting sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://luxesystem.site/js/ckfinder/userfiles/files/21329577900.pdf In PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11478255072.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/19336845550.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/xutetomosuwalap.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109152236562440.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/2806340789.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/nipiniga.pdfIn PDF document text
    • https://tigaintan.com/contents/files/damugijezutolar.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i0qkvebhabesj26qfrlgccbmc3/gizobojoroluxapopi.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/posinowomubete.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/8809739033.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/18453558310.pdfIn PDF document text
    • http://stringladies.cz/userfiles/46456988376.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2ead382a1---29794497659.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/95088394633.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/70224325171.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/7611521603.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/79836931998.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/76468699561.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2cf8680a---23258501694.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/fowutekegokogubelefini.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/2884941797.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/tudoduwus.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/veketugobajujidimibemexu.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/72127177512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=punjabi+movie+mar+gaye+oye+loko+onlinePDF 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_off0000beff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFF 18224 bytes
SHA-256: 3c0ed02389b383d9b83a6043b4656884872a502eb3a6230d4100ded7660ac345
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 10828 bytes
SHA-256: 4596977c613134e82d1e335c72aea5c3cba5909d6dcbd8382fcb13a548c7dea4
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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