Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe25e9f855fb6453…

MALICIOUS

PDF

54.0 KB Created: 2021-09-19 07:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 453e6e02751c06004fe141d06fb52921 SHA-1: 0171d4feff1699d630bb97ec1286a5dd16a17a6c SHA-256: fe25e9f855fb64538991b83e3244e545873f4b270c64f9f7a7a2cf3ecdba0bee
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. This suggests an attempt to obscure the final destination and potentially distribute phishing content or malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8111

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d76d25566---zedugovukezusumudikowud.pdf In PDF document text
    • http://wenxuezj.com/images/File/jowivage.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01ee8d6ad---turobubujunemomopas.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c727e59bb5---detavipisivizonurovagenor.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/3408072485.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/josevuwukabuwijanesipoj.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/segubabemujujikadijog.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/88363014884.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/25938791247.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090219100850.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/40707373169.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/digatexuvotuv.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613106ab3818b---87592524596.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/tuzusuxi.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/letumateguteva.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/96918149399.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/84498388367.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/65068342280.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/71332646865.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/57840940910.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d481fd5dd395e05ca10836b03526b79a/sowuseximebitolapenejedaz.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/kedopugonoduvanaxax.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/bapar.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210914090129.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/80440572996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=war+commander+apk+modPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB08 10356 bytes
SHA-256: ad35d2cfc8415c276bd204fc40fbc4d1ea291a1bc0d4140d7a9aa0ebaa646be6

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