Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d36552e1a655ebd…

MALICIOUS

PDF

85.6 KB Created: 2021-09-14 07:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51ae728d4994773a7169aa393a40c81d SHA-1: 7ed53f53b12cd4dd6f728002526b8cce58d088c9 SHA-256: 0d36552e1a655ebdc8e5ab0e6d64ef0339cf786d1845e14235cda7b3e4f4b43e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://antonellascarpittadesigner.it/userfiles/files/21134475145.pdf In PDF document text
    • https://preprodpcb.com/userfiles/files/vitoluget.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/sivasuxiw.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/ralopewujefowix.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jjoodnmae34bara7qas2nsniav/mutamajukome.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139409d2b76e---nobakaxis.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/kf6olg4pmdkivnmohrs7fsr3c7/fizafivawewifuvokowa.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/72226341206.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/19437592584.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109131152376929.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5e89c75ed32f83e2fc8190ccd6becccf/2112381373.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/18051537191.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/jizamarudelu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aio92crgm6d0aarrdd7ngng5j7/57243069539.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/foruweragomakubof.pdfIn PDF document text
    • http://18554080.com/userfiles/file/16904733415.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/9971041283.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/93110685836.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a3f8c1b8e14c05c31bff08972d23f9c6/wefokudiwugidebadula.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161336d9e7d9e2---nurom.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/25935113408.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2efd44b1b46a4f264005629a7b07e38f/voxoponabenapobesevusifo.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/vazenopisosazirazirafud.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/18223728427.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/berasogeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gamecube+iso+androidPDF 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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 19812 bytes
SHA-256: 60c9183d5aa84fce85ed8313f0045e2bd5113e20e513f26901bc2fd7dd54e62b
font_01_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 10664 bytes
SHA-256: 589229f44152f7b6029c8af5cf274c14827aabfb60c99e5ed1a3b963e35def8a