Malicious PDF — malware analysis report

Static analysis result for SHA-256 186215159a186508…

MALICIOUS

PDF

46.0 KB Created: 2021-09-06 22:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a40d797905f75af1ea25b54e31a88bb9 SHA-1: 11318fd241d3a05f60be1d852557ba354ef7947d SHA-256: 186215159a1865086a1b7a069992382419b1b5d07d9e974e96d744b2df043ba2
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript payload, identified by ClamAV as Pdf.Phishing.Trojan. This script is likely responsible for downloading and executing a second-stage payload from one of the numerous external URLs found within the document, many of which point to compromised WordPress sites. The presence of the embedded script and the nature of the URLs strongly suggest a malicious intent to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8799

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
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • 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.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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 http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803b91b9424---toxig.pdf In PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7c4a9ea7a8655a853a9cf8a1f85ea92f/ganipoj.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/57850839138.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3537a289---regutirakepevesa.pdfIn PDF document text
    • http://tw-go.org/files/93898108953.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/welejatopoxese.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/90978610111.pdfIn PDF document text
    • http://enerkonelektrik.com/ckfinder/userfiles/files/sivuvunodokirebugeben.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608415159cfc4---42152933684.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/88217395250.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/k3ii0sfjp70sjaglcg826aikc0/kosujomaxozako.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d71ce8e6d278cabee7654c45a1ccf8da/vegerol.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d019ca04710---71631325510.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/47244741304.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b2e653144a68ed8f9d77da543617386e/69172837446.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/77790036872.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/21587281255.pdfIn PDF document text
    • http://huiking.cn/uploads/file/200815464624.pdfIn PDF document text
    • https://yellowstonewildlife.com/tinewogokuvetakobaju.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/rexubabalurirogeju.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/kegukuvemizamulutizivad.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/40323282587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=powershell+convert+base64+to+pdfPDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000897c.bin pdf-embedded-script PDF decompressed stream script payload at offset 0x897C 47108 bytes
SHA-256: f04fcb42e7b80764d65fd102ace61eb207965a2b82e793a1b32be15991916129
Detection
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).
Preview script
First 1,000 lines of the extracted script
%PDF-1.4
%âã
1 0 obj
<<
/Title ()
/Creator (�� w k h t m l t o p d f   0 . 1 2 . 5)
/Producer (�� Q t   5 . 1 1 . 3)
/CreationDate (D:20210906225044+03'00')
>>
endobj
2 0 obj
<<
/Type /Catalog
/Pages 3 0 R
>>
endobj
4 0 obj
<<
/Type /ExtGState
/SA true
/SM 0.02
/ca 1.0
/CA 1.0
/AIS false
/SMask /None>>
endobj
5 0 obj
[/Pattern /DeviceRGB]
endobj
7 0 obj
<<
/Type /XObject
/Subtype /Image
/Width 625
/Height 155
/BitsPerComponent 8
/ColorSpace /DeviceRGB
/Length 8 0 R
/Filter /DCTDecode
>>
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