Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bef790890b24769…

MALICIOUS

PDF

73.9 KB Created: 2021-06-20 19:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9118ad0c117100fdef640da4d9c3d8dd SHA-1: 5743f0b17ad93aba8e5d7aa72f2a6b29be7f948c SHA-256: 5bef790890b24769e1a5a025b74330d990655eb5de80e1752c0f455e454d2651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=how+to+get+robin+in+super+smash+bros+ultimate
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2b81e799acd7e97e19afef969fdb434f/posegokuniminutux.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0aa12120e3d0c7c6b6a6dd825f4aea7b/59737449965.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb05a2c1ed8---wajojover.pdf
    • https://alakharia.com/public_html/userfiles/file/nemare.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3932b6b206ec88b10151ad2eb4d76641/80446578754.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9de8225694---16275817962.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/73f75f9eee92ef4c12bc968d7a2dd54a/82626413505.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859082864f9---kazemusukijezip.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/jimotunutegu.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/27fo63c0okopqel8qasun7rnbr/70456221495.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f45dd8ff3---87033731413.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8rvo8gl25t79faa9lkig7bu874/81587779837.pdf
    • http://www.aadhar-interior.com/userfiles/file/88594362219.pdf
    • http://epmachine.ru/d/files/2262055050.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e307.bin
3b2e8b743355c25af1703b1d005924881f0bc39d7b98d0ef24b3ac7662b544a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 5428 bytes
font_01_sfnt_off0000f55e.bin
e5556f98d8883cdc7d1d5029a57649506b40e4592209e0e991217772a71681ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 11032 bytes

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