Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57c64424f3d003f…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 06:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 304b7f8a7e384e3e780511defc97c5bb SHA-1: f076d38b46734d7e85118620310614bbd17f6332 SHA-256: e57c64424f3d003ff592990a43460c8b09a7e73ba355f25bab9ff216c2aed415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The PDF structure and heuristic firings indicate a deliberate attempt to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://toanthinh.vn/webroot/img/files/mabotoviwuxe.pdf In PDF document text
    • http://kustari.net/userfiles/file/nuvexilafesufak.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/zadufivugog.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/lesude.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/zawovetim.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/sepipisodizagatelovo.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/lonipimot.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/22269507956.pdfIn PDF document text
    • http://njchemland.com/upload/files/86424174842.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/gasopukulexibaxokijaxibij.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae8a4dfce0---sujurugugefuf.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/15233820874.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/gobuvevosu.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/2857717285.pdfIn PDF document text
    • https://cakkue.com/contents/files/votibagufopuxakux.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5cdddc937---debaratotesoj.pdfIn PDF document text
    • https://anup.bo/images/files/faxemelibipufeditaw.pdfIn PDF document text
    • http://tianfonmm.com/d/files/fogijagagikusub.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613383e3f3b26---mukabaxovejizobolutef.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6f8d42e9---napapejuz.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613720898cbab---rovoruvobudobes.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/drti5hs46d5d1u0cjp7c6re7gh/kebikudularuzere.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/zefojajudejatizafedivepim.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb0b09428---datafupetetip.pdfIn PDF document text
    • https://gdaniec.com/upload/files/sozetidugigenuraxinexadug.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/xasubufevewawokafofirukor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=brooklyn+nine+nine+season+7+episode+2+onlinePDF 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_off0000c7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F3 16856 bytes
SHA-256: f04588b9c032980a92e269611f37e49424c795224c322c644f36783de3b58f52
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 10716 bytes
SHA-256: 070ab459e40d185b5b61db79b0c6257eea4f0e599f72e25308529c0a8fb611a5
font_02_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.