Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6a1c20f9e541d9…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 09:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ceb5a729eda7e3f67defd4261bb41f9f SHA-1: 2ebd21b43feabd4869e25727617eabf393ec7e42 SHA-256: 1e6a1c20f9e541d9842f693609ada4910704b22c9a6a62a084b6bec62442bd56
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://ever-progress.dacola.com/upload/files/xixebojotapikufumidowe.pdf In PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/sapemezerupimonilomira.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136372cb310d---48267688578.pdfIn PDF document text
    • http://sdes.in/uploads/4219658628.pdfIn PDF document text
    • http://thecuriosityshot.com/fazim.pdfIn PDF document text
    • http://17njl.com/userfiles/files/medegilesexi.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/67357364972.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/96231568703.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/42939279460.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/radawi.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/gugakasudeni.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157812a4f783---75701880088.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/rusexodasu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/muwipufug.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/debela.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/fuguxonisibadexeroputijub.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145fba5f3386---87416352066.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/12458143982.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/nijulikuzubikerexowo.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/30145278737.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/jusobofo.pdfIn PDF document text
    • http://ijfbn.com/editor_up/kezoxalirerabubuzegiva.pdfIn PDF document text
    • http://aven.su/userfiles/file/5138544377.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/82899690f6815b36678ef4e8eeef137e/kitenuvuzawozatuxudiku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=nonmetals+and+metalloidsPDF 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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 10284 bytes
SHA-256: 709d87ae74da4a0625e05eab1f8d11118282d31e00e8fc4c2bcf7a5d6fd9a449
font_01_sfnt_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 16124 bytes
SHA-256: 1768c2320ecdab64fe9921de371e43087086df5f73416058b14622402fc8ed85
font_02_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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