Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad5db66cb21c363…

MALICIOUS

PDF

89.0 KB Created: 2021-09-18 07:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d602c6d89649cbdd416ed4dfadbf79a6 SHA-1: d40c59128273659ea4cbe4f264a936497b39bf90 SHA-256: 2ad5db66cb21c363f73506d77b036f1933b9e229fc4947f352cd106beaa8ba93
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or are part of a link farm, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests it may be used to redirect users or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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
  • 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://generale-bureautique.fr/gdb/files/file/sixulanotenawevem.pdf In PDF document text
    • http://espwireless.net/uploads/file/nikabazubexinenaduduzewa.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109152153367386.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wafekenef.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/29778963478.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/jotadaje.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/71690421211.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/baxozebujolutodinozu.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/14508210814.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/zulirexariniwofexut.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pokalagigepi.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/14302213754.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/vomesugevogefemikozomel.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b949373e---wegedidasegewogaliredo.pdfIn PDF document text
    • http://bamila.vn/luutru/files/ximofodalajejolo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c7ccd622---77574005399.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/61322544585.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/3el69qptfpu4t0pcqhvnb9lpor/52165472354.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/71773606506.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/95d4d227f5dc6fa56489ee859613e1dd/sijulamubogejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=to+a+large+extent+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 23792 bytes
SHA-256: 103581861731a5390f7d36068fe77606155f9c38c628b1deaf554c7df054f6ca
font_01_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12906 10348 bytes
SHA-256: 535e42b0ed134537de6127da318fa350ccc5f9ecc3f3d67b0bf6b2fb034413d3
font_03_sfnt_off0001405c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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