Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a7f4cf6d2144f4…

MALICIOUS

PDF

92.5 KB Created: 2021-09-11 12:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f897ab0ad2e1b0d5d4ef8a442212729a SHA-1: c4c77d60e626745adf001118edec080dad93f9ae SHA-256: 63a7f4cf6d2144f4b8c063e49000fce6518e06af8086328185eb3067d3ac5118
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=bring+it+on+worldwide+123movies PDF link annotation
    • https://motecx.com/images/file/lorudopoj.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/41565334075.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/3666056817.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/41698207205.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/katijuwitege.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/3045830518.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/jepezixawuz.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/33312319004.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79c535f83---nuxijugexigujeburilid.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1me4r5oeemf6a5hcev1vop64l2/55238275101.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/18737617332.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/pamulinekokaxogomekib.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/20987574583.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/67092873189.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/fuledogujulijupigupurazun.pdfIn PDF document text
    • http://jadeite.ru/images/file/nodur.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/ruvabanixer.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/guwag.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/46a7ee62564738736a72f32242a2d088/96826365489.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/39292354258.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/56043997728.pdfIn PDF document text
    • http://pileki.com/imgup/file/xitokefate.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/figazovegilaxib.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161304fe32bd6b---78923369681.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/lamowapuxivobik.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/livaxibatin.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_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 18716 bytes
SHA-256: 79e3874d5357e10daa5f3a50fe767a7399224038a8450d2b48beecfab8aae470
font_01_sfnt_off000132c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE0 10976 bytes
SHA-256: 12f2ed202629562880d62794dd62f6fe2d8ffedd237281204fe5c2dd50df7b95