Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf6acf06c95169f…

MALICIOUS

PDF

85.8 KB Created: 2021-10-18 07:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84f4fd58ceec2ef7a8ef3fb4e7bfbd65 SHA-1: 10fd0a7860a83847d2d9cf7662d9bc64cc47e6e8 SHA-256: bdf6acf06c95169f2859897b7c3e1f2adcd36fcfd4d72bed04fcbbb8ddf9625a
104 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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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://wastran.ru/uplcv?utm_term=entering+numerical+answers PDF link annotation
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161da8ab9d82---vejasuxon.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/somasimusunijarovote.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/80688350241.pdfIn PDF document text
    • http://elpijisystem.com/file/12143861546.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/47c275429a49cac94bd202d7c7f50d6d/93752407489.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/pm3117dsftcktl3bink6d1qkiq/89226803949.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/19731922004.pdfIn PDF document text
    • http://stonebreaker.at/77276617084.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/34772205732.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/fakonakogukonudanuwofoji.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/13730057789.pdfIn PDF document text
    • http://smileorganic.net/smileorgfarm/filesupload/File/3784384151.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vaviwimofesawexurajanijo.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/efe12a074267b34c8ad227fd7e5b6ee3/8398443575.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/zoxin.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/80112663764.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/vepivedo.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/rufewoxudajefaxozunomube.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/gufogezukuwipunerewa.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e7d64dcde44aa575711fa7f08fd1f67d/zominapuselusu.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/47697277143.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/crblc670e5m052929i3dr4gd1g/zijezurozafivavokizigat.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/41459362838.pdfIn PDF document text
    • http://htwy.com/upload/file/wejigeg.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161668f64d9c65---43837360850.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_off0000e7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 10624 bytes
SHA-256: aef6d6a392a05f440d55e43f3c17464e2e027f3c61416f6a941b59dea306b763
font_02_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 18688 bytes
SHA-256: 4d3101805aba5ee74fd34b5cdd275fbd59e6ce51fe900d4a37861807395301c8

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