Malicious PDF — malware analysis report

Static analysis result for SHA-256 d959e6cf897df1bb…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 17:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e02e49ab55e6eb8ba08fd59ec90f036a SHA-1: dea95d3267438ff18aadd6838b63761dc2c650ed SHA-256: d959e6cf897df1bb212c78ccdcce6a452a60ff53bfeab22852a82bcd793a97b0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://vertracapital.com/uploads/files/69331259240.pdf In PDF document text
    • http://st-johnson.com/Uploadfiles/files/folaxoketefetijuletawipez.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/93006176093.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/doxakuvulotavotifegaki.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c74056533a---27319421784.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/2592707060.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/33589343459.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/38152542154.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/59186055025.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/motiba.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/wogurujufe.pdfIn PDF document text
    • https://mbbs.hr/files/ganowos.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/bugodariwimuvepaso.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/simadevokoxuzorix.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/e9uk29iu5tf1thb4bqkomna3j7/figezamov.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/25813455556.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/425539ba3372c44e4f341751704d6178/magiguvudu.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/25572844884.pdfIn PDF document text
    • https://partnermind.cz/images/files/8461636292.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/66890237807.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/4dc243e197737e787d789afa7d0540d2/3460650018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=assassin%27s+creed+origins+strategy+guide+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC2 17988 bytes
SHA-256: 7f0097f21b131f37479df5554502a1338cb2d8cf53d0f4c3ce4987bcc9303211
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 11108 bytes
SHA-256: 365acb07e7f55252e9b89fde66c6ed445cd1f75f4569690cc7eae56177ae9010

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