Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df3d5fbba380af5…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 06:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 666a0c35bd5751d8b5c916adae5f9f11 SHA-1: 9196136e1fba693707c36cb4407823d01c679c8e SHA-256: 3df3d5fbba380af53e9f12d88f13600f1bbe80e379536f417d1566468a389435
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=how+to+tell+if+a+function+is+linear+or+nonlinear PDF link annotation
    • http://pattarasawat.com/ckfinder/userfiles/files/47664567377.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a8910eca1da740d8837cdf528eb36172/wenorowaxeman.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050316471773499.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/95229336826.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/komijagive.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d6a7bc5c1---84704440624.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc676d5ac---runadezekit.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunigedexalorojomad.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/21q44v4vn37848n8d1j1qsrodr/zolevuninalozi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/87977335789.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b146bb47f9a---31635887959.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/384fee609a41a2dd539a55682341d5c7/doziwefewoxaxomufom.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/29145779691.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/35569983654.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/pajefolipibefesapuxu.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/manosojapuvelezawipimoki.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080424495939---sedokekilijakabov.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/82669964964.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/wagoboxazitewer.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/96993375313.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_off0000c2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FA 10508 bytes
SHA-256: dd6177361fd8611aeaeff4a3408580cd4d87dfea596ee3fcfca972fcffa2fcee
font_01_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 16884 bytes
SHA-256: 8d544ea39e8263c43aff8b8e6ab9c0b257ce96b9d48899627c862d1e2d29803f
font_02_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1