Malicious PDF — malware analysis report

Static analysis result for SHA-256 76073de1f444e414…

MALICIOUS

PDF

98.8 KB Created: 2021-09-09 09:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5b6def999fd115e9da17efa04463680 SHA-1: f26b8f2b1db9851312a9c67468cdc5dff2a08d2a SHA-256: 76073de1f444e414aa96c24ca3c9d4a59c340b843904c7c1cc369522360508b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to direct users to malicious content. The presence of these links and the nature of the heuristics indicate an attempt to exploit users through deceptive content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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://grandinhr.eu/images/user/file/94092845110.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394ba779fcf---14233244131.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/2344ab47e564f0e1c9a7b58b80d541d3/20407103651.pdfIn PDF document text
    • http://askaudit.ru/price/76936707008.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/nejunov.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a9ee6223---zofapigoveropezumenepure.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/firipud.pdfIn PDF document text
    • http://proxima-online.it/public/file/97665154695.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/73455720532.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/waxirewojunas.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/31978842395.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/14693905868.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348de9b2108---jidoraxutedepubis.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/bapojirafowatetudugogowu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ga7bt6saqhv9jgrnm7gg9n3ap/40154494399.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///82059338125.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630473889.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/86199688611.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/73915792060.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/76939695529.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38997944044.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/51684195340.pdfIn PDF document text
    • https://hiroyoung.com/data/files/tapozutukuvazaxerabed.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/rinuzupopoxinok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rc+hibbeler+mechanics+of+materials+8th+edition+solution+manual+pdfPDF 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_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 11376 bytes
SHA-256: be50e0d3e14b21224c515292789be044aceaa3eb73826291c2c17418263f92f1
font_01_sfnt_off000130e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E8 19448 bytes
SHA-256: 3b0cb8bad247a650088aa438c17a88454cf43bf79a885c39c7546fde38a6c5f5
font_02_sfnt_off0001646b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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