Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae36f6328e92e005…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 10:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51d4044eeb5ec64f126aac0edbd869e0 SHA-1: 8cef1c10d90523256499839251f7a31b182e6606 SHA-256: ae36f6328e92e005facf5bd21d805ec57d14c199cc4cd12beb49726515091f5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on compromised websites or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=multiplication+of+fractions+worksheet+kuta PDF link annotation
    • https://lensprovn.com/ckfinder/userfiles/files/vumodotudi.pdfIn PDF document text
    • http://hkalc.com/userfiles/67006309897.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/xulaxasijunakavaw.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/39688762600.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/37d324dc6dc2518de4debd6cc3f7ee8e/belizeguzuwamom.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/15201107758.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece85aa4c4---94952060191.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/1870690629.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d1cceca4---wavobuzurazezilovesudena.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/6193bbef4d18aaabd10fe3271cea367c/80321182990.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ba547fe92f1c9a84ac73a2d1a7285e73/kowowegajodemobokagakul.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc480ed152---pipixazafaxamipom.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gpveg21anl62p3fisiq0i182qq/wofegakegatal.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/10897904109.pdfIn PDF document text
    • https://andhimazhai.com/images/files/rutojetupisuxivajevipibim.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/geson.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/8646670231.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4708606953---zosutud.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/63620810805.pdfIn PDF document text
    • http://gdgom.com/upload/file/2106140655328573134naww7vn06xp.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e941b409cca53255b5e86b807183746f/15650297700.pdfIn PDF document text
    • 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_off0000bfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 17268 bytes
SHA-256: 104ddf378898bd13989dbaceb029ee5a3e7c8face4d13fb732e728196625405f
font_02_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10848 bytes
SHA-256: dbceae97c8ac45e8b1caab07aec1ed9d4612c2e0e334a36ecaf0a784f64f66b3

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