Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a26d58011c83ee…

MALICIOUS

PDF

88.7 KB Created: 2021-09-19 01:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4094c2e33064d370e35a01c42d92c92e SHA-1: 23877481f0e712dff7899c668bd8a07c99247af2 SHA-256: e6a26d58011c83eea66d039f16c7a5a70ca626b66169262d31d291e91fb1f154
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicative of a link farm used for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing campaign designed to lure victims into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=descargar+emulador+playstation+1+para+android PDF link annotation
    • https://badrivishal.com/media/raradojeloresume.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/juxurijevibekofefugegozak.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/25707131200.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/piwofibenupajux.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/82614261921.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/35289887500.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210914_277451852ACCAEC1.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95774f340---80091297025.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d4090fb41e433667a2b17d6dc63d7da8/medijirekorapik.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a42d15ab9921187bf6e22dd0d9eddf11/67982082869.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/pulusuzibagubogatikasuxok.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/raronefeguzosaz.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/46114142683.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/25267963854.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/59176603555.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/dumobuvena.pdfIn PDF document text
    • https://mfdesign.hu/files/file/tajegegef.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/sevebivinabanenudifa.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b62fba43f2---78077523234.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/dinunewopewulokolewid.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/taxivive.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/80175317035.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/rizudokuputupewogo.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_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 11124 bytes
SHA-256: 6e99a5affcf290cf1e231d4b7bec53aaaf07b37e37e3edcbd745e339bc522b96
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 19268 bytes
SHA-256: 2e148bddc6c3a2354e7764595a308478e9a7c6070b2a6e831828f6b37c3ecf28

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