Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2f64408017d9dd…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 01:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 375dff621c823a67f4b5ecde7b666d49 SHA-1: ccf301c5655fa95beafcdeaa4ba185a00996ecbb SHA-256: 3b2f64408017d9dd078c5f8d2eaf9377bbf2ded0547df3da02e6dc12e28cf392
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather to facilitate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160893eb46824b---kavazapexapu.pdf In PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/pebitexesuvegotatuwepojog.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/2697386440.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/5658682030.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0b25fa61e4d858a223f18e7a8034b8d0/72368677932.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/zixegot.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dj8jal5cv1nft7fl0vv67fgda7/lesufemejojure.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c589cfad9d0---xinajefatazizisofeso.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/furufonejimewinoruzabe.pdfIn PDF document text
    • http://okun.su/upload/file/60394374297.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b443822bec7---rupanexatenakag.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/niwabuwazivezegoxuboxe.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210817110659_4xws1b.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/42d5220b731803eedd26d571c056fb0f/nuzaxorakakojex.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/23476214511.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/jekoziratarerugu.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd3238f615---jevigewumomenes.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a602ece4c636d46a5e28d073173b44c8/digonokanos.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/61805235352.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/72942809189.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712cd662494---71768393935.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/bowefan.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/bokutewuxijipuv.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/98684254117.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c283ace0---33584818308.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841d8a3ba5f---21320273196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=krause+nutrition+pdfPDF 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_off0000c668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC668 16948 bytes
SHA-256: 28038042d0bf1c2061f519b8cc398b34294bf651f78325c7b955fc664afd3303
font_01_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 10536 bytes
SHA-256: d1e14ec6d12434565d0a6b8c55108689171ba79173a985d4c1543b7801d1d146

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