Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c52e619bf7676a9…

MALICIOUS

PDF

84.8 KB Created: 2021-10-05 16:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b49a8c0f003bafe7c69785fb23b6d09f SHA-1: 694a511ee4ea0e9d2a4615258f94e802a84fcc08 SHA-256: 7c52e619bf7676a9fe0e9d35ff1023f6c02180846f30f9e16cbe9d3ed75cadd2
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely attempts to trick the user into installing a malicious browser extension or update. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=it+chapter+1+free+online+stream PDF link annotation
    • http://adaviestransportltd.com/userfiles/file/42257453268.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a1c7519132bc0977dcc82fd4d532e0fd/mufolosixewoximirodiju.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/zulegujoxomixow.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/pidipewo.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/mitumisemanarud.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/gidevebilakulesomina.pdfIn PDF document text
    • http://vladekoservis.ru/files/lipan.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nigatiwobimusunesobunero.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d86f72839921ee2da8bd51b506e93626/sexid.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63115288400.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/97111679885.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/todogakofi.pdfIn PDF document text
    • https://izr.fr/files/72086209486.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/modekujujuza.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/58858145526.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/kufidowunisixupujexus.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/55404475489.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161409b267d6ae---81713179276.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/pazew.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c98351d9c850bdd8886c62009531d507/35409268671.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/rudumugefotatusekim.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bebabazupenatujavula.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c4a6d55c6978cfaad1ae65e1b8afe948/jinipijuvutalezidovore.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140302f41d32---xakefo.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/93998283235.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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 10748 bytes
SHA-256: 073e5b95fb54e760185b4251fadeb74ae00582114c8ec905c13e5e81184f76e5
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E91 20500 bytes
SHA-256: 61bbd494c682728b41f0e2a9e8bdf8bc405b52eed6ec4728d348edb4ea58caac

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