Malicious PDF — malware analysis report

Static analysis result for SHA-256 e919fe39da5a6a58…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 07:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fd24cee347f0350347a223f9007104a SHA-1: bef7e9b0d477cb72346646e75959a287cae83d15 SHA-256: e919fe39da5a6a58d2451324658b083c274a581a93fb6e15372d340587c6ae3f
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'visual download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=pokemon+black+rom+exp+patch PDF link annotation
    • http://netmode.net/app/webroot/uploads/files/nemelatofobusagugiz.pdfIn PDF document text
    • https://senfina.top/uploads/files/tekuzirebezipalipa.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/navonopivedufufa.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130dfa477318---34604454493.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/rexazulakixizukezojonimas.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/porojesepadev.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/71906750587.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210914022815.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/97682221058.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/44091845026.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5e0807a8b9ba109cc76d39e60690836/766467911.pdfIn PDF document text
    • https://senegal4d.com/contents/files/sobetunet.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/1182984002.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/99722851680.pdfIn PDF document text
    • http://velisend.ru/photos/file/52354236731.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/66349941953.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/ruzapupafi.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/23408551640.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/judemosamafufurasis.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c254c5156---58276692709.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/84845018300.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/31361972500.pdfIn PDF document text
    • https://grnca.org/img/files/files/98703878586.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/fenufelikuw.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_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 17772 bytes
SHA-256: 898dfac5c7e7821660300c8c53108e67b529ae91f1df5e8fc5a0667ca62dcfc5
font_01_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 10712 bytes
SHA-256: 0cf831b536037c1e5b2ab85b8f81049a7a926f7acfc8a6bf558cd22c03132149
font_02_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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