Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb46bc583334e6ec…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 05:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6908ec6712fc9caf9815d41141d641f4 SHA-1: 7f755af4ba4a1b3da894bf963fe82f8ca4ef3196 SHA-256: bb46bc583334e6ec176063d76228232e4238651d83ac4b7e73adff9c96370910
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which host other PDFs, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious intent. The ML classifier also strongly indicated maliciousness, likely due to the URL patterns and structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gta+san+andreas+script+download PDF link annotation
    • http://rklatex.com/userfiles/file/55719380134.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/73703225398.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/n7nq9q5k0b1l615ngo21oertn9/13253940521.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/bowobo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/64c313b7f040bc43518e72fa60e1cb83/tarefadinitabugusujop.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2200e22eb---donoduwilosopazanegi.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/velexuwilur.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///77066921200.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109090004218791.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/20528409369.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5utsobdcli34r3l1khc58p2uql/31278233624.pdfIn PDF document text
    • https://armenia4d.com/contents/files/tanotakalobepu.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/puvegoxadibekapiwerinofe.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/58890117728.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109052255118882.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/jilefi.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/bisotomilozajonizu.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/35372779332.pdfIn PDF document text
    • https://matricula.arendic.cl/files/bixurinedosabo.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/96040846193.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/83722857073.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/maguwazipadonudoturewu.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/13328134669.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_off0000bd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8F 18236 bytes
SHA-256: a5dd6b1956f1aba336c2ed82be03ee2a2402af422991c5fb33ad0729d6524830
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10632 bytes
SHA-256: 1a6583dd429fa247251af5b52229f45b691bafe3c4ea12059caf6cefb9037a43
font_02_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1