Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1ce964fbdb5395…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 01:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 46899cbe29b4d55249a542d3ed4521a9 SHA-1: d993a82ee2f3eee656fdf215af5656017722f0a4 SHA-256: bf1ce964fbdb539568bb431fea585f2be09a4cf08a1e4999f3b77ba0f5710d65
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

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 https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/tuwesa.pdf In PDF document text
    • http://hospitalityroyal.com/upload_files/file/jenamojugopuzupitov.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/34855897978.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6ffa7e09789ee74a77bd77a73d0c8693/gaminurawopefuwubaju.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fd6b1c636---75203000017.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/946400d550e9a7a38d777eeee606034d/sogimavewarako.pdfIn PDF document text
    • http://levotst.com/uploads/files/93687303446.pdfIn PDF document text
    • https://spacio.hk/attachment/file/neroj.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/jiwapafolegujiv.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/rowutejutawimojixobejufaz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad57b2b602---safebiwowura.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c45bd02efd577096cbdb51c36af316df/73239519927.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///jenodatejibav.pdfIn PDF document text
    • http://feminella.ro/upload/fck/64458069635.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613932e2c6583---putavulozibaxi.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/5479511171.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/mefalisofino.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/metude.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/76328803715.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/kugodewulajorezited.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/kuvowugusuzagekasivu.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/xatipozadepi.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/6104713902.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/16959103671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=carrom+disc+pool+apk+mod+downloadPDF 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_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 17404 bytes
SHA-256: d3cdafaa7c9a943facb87752085629e6a6ae34bd26b29ef58f3dcc922234b2a7

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