Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdb59bd5f8e9446…

MALICIOUS

PDF

47.6 KB Created: 2021-09-03 07:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f1c1074683c82a63ce429be159abb6d7 SHA-1: c5fb55fb8b05239ff22a56d10546600da386c59e SHA-256: 4bdb59bd5f8e9446dbbe5597f11788308d7b3937e2f5961baa487be499d6a7e1
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript payload, identified by heuristic firings such as PDF_EMBEDDED_SCRIPT_PAYLOAD and CLAMAV_DETECTION. This script likely attempts to download and execute a second-stage payload from one of the numerous URLs found within the document, many of which point to compromised CMS uploads. The presence of an embedded script and the nature of the URLs suggest a malicious document intended to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6676

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://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c988fc5f28c---62197886281.pdf In PDF document text
    • http://adveotec.com/img/file/pasanikadofojitexesaxo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7fbe6d111a780fc6da135c8de8e81ea8/34938924170.pdfIn PDF document text
    • https://hse.tw/upload/file/50616903099.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9325dd16a---81955992287.pdfIn PDF document text
    • http://devveb.net/userfiles/file/9742223356.pdfIn PDF document text
    • http://cochu.net/resimler/files/penugajibinadara.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa1a0bfe53---74445759247.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/72571518432.pdfIn PDF document text
    • http://skia22.ru/pic/file/zetimamapesizuxosepawofof.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/naxuribofiwubu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/43893991442.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5o343f200jo3rb3rjuhjfr3i11/4233499056.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/tudapezajutejite.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/fopekewolebuw.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d31d2116b71df113104145dac40bb71/4544308487.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/26984580021.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/firamowedupaxawolujuzor.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/tizimosavifarenugut.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/26380171571.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/17702079315.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/78b8f89a64e01468c8d23c58d8b19e59/tifijogi.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/jekelobofiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=powershell+cmdlets+pdfPDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_000089ac.bin pdf-embedded-script PDF decompressed stream script payload at offset 0x89AC 48732 bytes
SHA-256: c1dab3b3605170cbae005dd1a08423b0b486727d418b74536abb70a569d91b7f
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:20210903075704+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
>>
stream
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