Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ceb7d3fea88b5cd…

MALICIOUS

PDF

83.4 KB Created: 2021-08-08 11:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2218cc22cfe239402bc9f986a54aa01f SHA-1: ef8b453a660522dacb9f1eebbc0ace7925401b5a SHA-256: 4ceb7d3fea88b5cd7c2678409a6032d9902154629795d3a543399654c10838b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and link farm structure indicate an attempt to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://infrive.ru/uplcv?utm_term=what+uses+rotary+motion PDF link annotation
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b169774e---takokanev.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021050908464566976.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/97fdb4ab8bc5041b1f118f52ee853a44/sirudufalaz.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/94565932261.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210606022232.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe3c46530b---sobokegisowulavufex.pdfIn PDF document text
    • http://amdind.com/userfiles/file/9882286891.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/86264482135.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210729214853.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/934ec623acbdaef45c42840a0768923e/jonanixarud.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1c29262d---kajosija.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/26305789352.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f420c1d214---jexasafimunekirorotanuzad.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/33545609232.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/49966331154.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fasoxer.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/85803549125.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/45940540588.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/4112402123.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/64639945604.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160899eb290e76---dekaxixinefafokipivibuk.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/37829038259.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608231efdafca---nekirevetafela.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb5c669ee---92200731126.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/97938116765.pdfIn PDF document text
    • 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_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 18044 bytes
SHA-256: b9ebc41b176414d12afd960245fc932e662a5365a7a88ed4b1524b261e4da431
font_01_sfnt_off00010f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F51 10532 bytes
SHA-256: 47444ffe23c9cbe295ce95ecb567620ff919f71e6fde66e1ddca11cefac15604
font_02_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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