Malicious PDF — malware analysis report

Static analysis result for SHA-256 9930b43e55524409…

MALICIOUS

PDF

127.7 KB Created: 2021-10-10 12:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2034d1b70e745fa1d5b909c9a3a28c49 SHA-1: 3695a456b02c2f90b08a3904501e2e5ba48939d4 SHA-256: 9930b43e5552440907a90914b952a2de95b6eee2d3072a67884dcf3fc95af22f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The document also features a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9274

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://smidgel.ru/uplcv?utm_term=grade+11+forces+questions+and+answers PDF link annotation
    • https://interconformity.ro/images/file/73656854729.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161364ee82e531---43348494120.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/siziwobixu.pdfIn PDF document text
    • http://ndt-ultratech.com/files/lefejolenonariba.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/17306147676.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/xasawaxuwijiwivefexasune.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/49033958866.pdfIn PDF document text
    • http://usagimatur.com/files/others/64789885576.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/95466584246.pdfIn PDF document text
    • https://urologasdainys.lt/userfiles/file/18789517668.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/lefixanofuwe.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/damudezefibozetifamij.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/27193465346.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/jibevevasijat.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/defumij.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109161006492274.pdfIn PDF document text
    • http://babamoleskine.com/files/file/98862322044.pdfIn PDF document text
    • http://metall-press.ru/files/pumum.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb166e8d9---93039806041.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/619bd691d2af890b42670f57474e19ff/xabaredimegupivimizubewez.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/zujaludome.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/53731066774.pdfIn PDF document text
    • 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_off0001e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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