Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf9b2db665a612d…

MALICIOUS

PDF

107.5 KB Created: 2021-06-27 08:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83c8b9881729c01463c46a6da695443d SHA-1: f8a6c0903e471672208a46f1e8a0e598ff49b540 SHA-256: baf9b2db665a612d8b129e3a63c3e8d4caa462726090db8d840ed18dbbd35169
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/62dd6cf77e43fa2d789117d68f602252/xaxebareroputamo.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d268f2f30---79989266820.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/35221990826.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b09a7f40b1b5320ae5a6090f5d73b563/26335225205.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdd48a270---wufelejaturet.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/44161390615.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/337663481531a5a8568f6097bd4ab018/60188596760.pdf
    • http://tydafa.com/dafa/uploadfiles/20210610085049.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/fbp49u12a5hddu4ut1ntnrfbme/wusuk.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2531c6da11---51712821012.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6ae747a3f---13591716420.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75d796ead0---5914236560.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098673685ebc---sovipobaruzazafo.pdf
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/gobotave.pdf
    • https://tecnibat.net/uploads/archivos/kozono.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/937d6bdb8288343eaf1aebfe559c7ebf/85437774740.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/be003dd54fcc77b5d8792a76ee88b1f0/pedamefa.pdf
    • http://hcvitamin.com/webroot/img/files/62931074502.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a97244b789e405cfca74dbd88eca1341/xaximuxinateboxogixixosi.pdf
    • http://gemculture.com/userfiles/file/68723312144.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/rdo3ipida6vovgo0i22qs1af22/dimonidajajetek.pdf
    • https://louvre.lv/res/wysiwyg/file/nidezijadubele.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1f3eccc428feb251ee3aeef086895ab8/92361761462.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=d%26d+online+character+creation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016dd3.bin
d9536d663ccecbe62003f54334dc0df9825c0d1cdb270ef67e79c793df8615da		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16DD3 18428 bytes
font_00_sfnt_off0000f6b1.bin
1ea355d2c8e0883f1d92b3411736db53c3620e72d542c79f85185752743a9d07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B1 34288 bytes
font_01_sfnt_off00014683.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14683 16792 bytes
font_02_sfnt_off00015e90.bin
5accd28b93f88256231765d54412dfb73b7c8b89e0db92651776be48329af4d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E90 4040 bytes
font_04_sfnt_off00018bf1.bin
f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18BF1 9076 bytes

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