Malicious PDF — malware analysis report

Static analysis result for SHA-256 36585a22ceca3b79…

MALICIOUS

PDF

87.6 KB Created: 2021-06-27 22:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6716cc9ade53f7b4ea1c1a6fc6a6bac5 SHA-1: 2e9a0e1e080aca540d02905697c8c0642629dcf3 SHA-256: 36585a22ceca3b7997872a371be6505d3b267bb66dbfc77d90c8e9a989897391
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is likely part of a phishing or malware distribution campaign. No scripts were extracted, but the presence of a link farm suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://ph2020.org/FCKeditor/file/30885973004.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c24ec37b68d6b0a0e4afcc1f34247fb3/vitufegenegagazadukozu.pdfIn PDF document text
    • http://cocoal.com/uploads/file/vumosizinu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ed1cda4a---20117685844.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dfca4bdd5---87553088123.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/61468333333.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c5edf756---48336502710.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/602d9590c049772688ab628cf72fece8/zetuvusikorenufolobe.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160848788f0211---golanepajivu.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/mugupajaxenozufi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791be04c2ad---fitukunojifudaj.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pevivivufebogijax.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/29744854750.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ade444cbdcb---44085866254.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gne3n3luhfk8qfb8fd6r09n8j6/sezofazojoboji.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c38daddf68b---dejedumenufu.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/67114712226.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90d7c3083---keguvuwevolu.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/vetogudaravevetuponizo.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071b665ddf25---jofekuminuredawofetitesod.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcdce04c87---99665858463.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/fm83sb2mcipdipc10mcvk4o42s/85933695368.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea7647f26---komonirufopasa.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/15939a7f8d3cec17e2b690bf00b0a04c/logurenujevibevovabajux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dehiscence+and+eviscerationPDF 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_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 10488 bytes
SHA-256: 230ff4c1088c80245fa163bec7a361b3e5e03aa4bb39dbcd94fa88c6006c314f
font_01_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 16612 bytes
SHA-256: a5444bb662a0f7c6d339ab4dc56d3b6c312dbde69858f3430cec4a13e8700780

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