Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0ba2753d0d7db8…

MALICIOUS

PDF

104.4 KB Created: 2021-06-27 02:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d29a6d2cda4399dfd04afd96c786c193 SHA-1: 48003205f3d38011431e79822911861cc22f942b SHA-256: ad0ba2753d0d7db84bf3a56b8e2181aee2ea8c22e919db65c27e4dedfc66d2ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to distribute phishing content or malware. The presence of external URI heuristics and the compromised CMS upload link heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=autogenic+muscle+relaxation PDF link annotation
    • http://clarksville.net/wysiwygfiles/file/musarulazoveze.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/5c4b831a0dce2a5ebbbd62f97ec33ae2/tedurasofimodojiv.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021624161729938.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/3oc8tbqsm6qn7phlhelc4nj03q/67715835082.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a11475e726e---11119925220.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/9ce5023bedf02b81b62e55c4413c6eaf/dagomufematubovo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888dc928b7d.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16070271f82873---21487284706.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/tobiruviwamizato.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/13052cd29cd3f52d40bc601a218cf297/filijo.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0d48b9902700ee6cbbcedf32e384e978/95767672347.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/nunimo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe96206f8---telopolijusalujiwuvaropet.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e38c838458ffbc6999241c6cd52a2a68/nanusulawedurokusukidezej.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/57e48a191a9a73da2d29019a89c64b7b/bagokumirogemafabatokilet.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/78380640512.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/turirewirakoderit.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/90koqu291h8me3hofu143h1qsh/73530607138.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7ec897d26dc6d85366e41d9a6adcdbeb/51434028081.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/zunes.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8oqdrh2rbcrmt4nomjfnmg2jh1/549832065.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/74e886178e744e29b23c579d707d3262/30615067288.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_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 10756 bytes
SHA-256: c6ff8252e307cd301520ed0fa9b78ff82783cb80a01d2b472b338c64287ebdfa
font_01_sfnt_off00014c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C51 17704 bytes
SHA-256: 4147de6ced79760688ca11b3d31bd905a83dbf8701e848c6759a04de902dc33e
font_02_sfnt_off00017af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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