Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f284459e300969…

MALICIOUS

PDF

78.9 KB Created: 2021-09-01 08:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ffbee95eb8908e1a989d538b16e5342 SHA-1: 658cc49680e7414fd3e14b4c4de8052312641c55 SHA-256: 35f284459e3009694680b98a900c8a3fefb9ad6514722764c55e63819696a812
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised websites, suggesting it functions as a link farm to distribute phishing content or malware. The presence of these links and the overall structure indicate an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115d01ff3fd7---98235066575.pdf In PDF document text
    • http://hydrem.ru/images/file/kawodikipakemabu.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/88685382640.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/9b55e0f6c9c7ed4da04f92ec11df7497/11549422829.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/97111273286ac8ead2fb884dd11c56b5/29614839573.pdfIn PDF document text
    • http://markone-tools.com/upload/files/92917921404.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b0969d6be5a---86474139167.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ir4csmj41dghsu2v5c24it5u4q/29300835771.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9858c5e8c63a0870ce42ab63318eae0a/zoxivebovawawife.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/97823426371.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/56427369745.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jiwoxa.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/jujobitizuraxefowi.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/mojesomavamexisukitalef.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/setofezanizali.pdfIn PDF document text
    • http://ciskmv.com/css/file/61020435510.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/desitizet.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/dosebutav.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/topelamesegomiwe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609618ce56069---89741838133.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a4908a1fd87---fujapuzezoxunox.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/fajugifisamowoban.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/rezabuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=office+365+exchange+manual+configurationPDF 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_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 18048 bytes
SHA-256: e587bb59c4d64630a7aed4312db378d55fbe714e4695504876e5cf1aa0b573ef
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 11316 bytes
SHA-256: ad854ce0eac2e9c2992a04a17291ac5b759e1d47044a5f8ea8e7315eb5999c20
font_02_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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