Malicious PDF — malware analysis report

Static analysis result for SHA-256 8960848122a9f4fe…

MALICIOUS

PDF

77.5 KB Created: 2021-06-12 13:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1075138609c0da834e064faa1d0bdf6c SHA-1: 9fa62561f7f6f83df4c726672f5627d38296fd35 SHA-256: 8960848122a9f4fe771716052539b56f1cf0b07996026be3e72f9263ec54427e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The embedded URLs and the heuristic firings indicate a phishing attempt, likely to trick users into downloading malware disguised as software. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing campaign.

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://infrive.ru/uplcv?utm_term=nfs+most+wanted+2012+for+pc+free+download
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dki9ki59lq7ds81neuvp391aff/revewuri.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d9d3d0b0---togibakuwesipojifuzofo.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3bb579a85---xiduwototimumavagexikeb.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/vbpfb4vmtrba8ir19qh1u66gp9/dedemusatigujo.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9ee0c777c---nesofes.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cn1rp1ag2acufjv76qfd5d16u1/59670105410.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qq54h06iefji2tavd1h41vh6b4/77749004724.pdf
    • http://jhferry.com/data/fckeditor/file/%5C/32439301042.pdf
    • http://files.ibiza-ferien.de/file/84375998397.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5b768263fc4df270aee1b515f99d9a5e/35883716902.pdf
    • http://clubesquilacoma.com/uploads/files/63462558810.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503220110626252.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kiioi8n6i6a8s0h0hc1p61ur6g/sumugufubedol.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc90ede21---89836969586.pdf
    • http://svsteinfurth.de/radsportfiles/file/44235420738.pdf
    • https://sonarmusic.hu/up_image/file/zedofibisag.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_off0000ef14.bin
1d83bff6c9e3552fd474fd5865ac32f8dc59d71f2cd9c00e59ea8016011c72a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 5688 bytes
font_01_sfnt_off00010280.bin
dc53f05314387ac98ac6681d8d7f306a03fb2f2e9880410bab55f0ad355ecf6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 11112 bytes

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