Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf646a5e1a493b60…

MALICIOUS

PDF

87.6 KB Created: 2021-09-15 13:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bda30bfd6899ad3f37aee6f71fa64ca6 SHA-1: 963597f343c672847b562844e7f1ecc7540d445a SHA-256: bf646a5e1a493b607c96fd2a2562511fc638ef1f0e0876dd46df62940aa27b77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=ragnarok+games+for+android PDF link annotation
    • http://sztarmedia.hu/_user/file/zawifelowudozinenuwe.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/8683433208.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/16991074814.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/zitifusuriwul.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/95182537296.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/66446105192.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139be0d8ab9c---begalomunixupubif.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/pugibevufiru.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/29164166020.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091121100454.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/80501726563.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/kubafibiradomixa.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010551f7da---sasosorefobirodirazudasu.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/74283884854.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/109359fdf86a593003923051039fe29e/jekolejalatasade.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/noduranewanada.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/garutepa.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/19054133770.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/4877348338.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/29562842554.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/vuxosotafimotogopa.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/vogujesajotizomubonupo.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/76416918080.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/zaxogowunusapawajulo.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_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 17392 bytes
SHA-256: bc04bae17e30b4176cb0798c63e20d32f5196d080754231a698929a819b2148f
font_01_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A6 10688 bytes
SHA-256: 5a973a5d4f09eddd4aef8457704ef4a28e15cf8d97107fca00d347e4720ee663

Open this report in the interactive analyzer, or submit your own file for analysis.