Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ffaa4d994f130c…

MALICIOUS

PDF

179.2 KB Created: 2021-06-10 07:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 33cf2dd7101bd999dea737248d315399 SHA-1: 7c14b86a0e9ee9c72c0891e5c0801b05bb8133c5 SHA-256: d6ffaa4d994f130c43aeb7efc896006ba3128fec6b86e0659f4b455b47564dde
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or spamming campaign. The heuristic firings indicate the PDF is part of a link farm designed to attract traffic, likely for malicious purposes. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=unlimited+free+vpn+for+windows+10 PDF link annotation
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a27ff66fd684f509a8250144b8d2ff27/dimejozugej.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010ca88eb2---gajifudaberanosilek.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1821f8ca---xavetisatajexil.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/12778855756.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/773c9ef497f5e389708827194323f38e/38575119334.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608931e9ba7c0---vemuredakofapimiwoxuxobi.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/38868882455.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16087a02bbe152---75890427605.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mhmv7h6pepqldtseggdefnc69v/nesegekifap.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0e5d598f---437845610.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/91930968959.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160771dd2e1d3d---razufuxibe.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/c50e780b1de5f14a7d1dd5be4d0ba690/banexuforipagake.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b27c8fc749bb5f8f17b4775bb2e591c4/27813217149.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5a1a4e42de511bb52a86601b44db53ac/45600800633.pdfIn PDF document text

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