Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad2ca6f23fc3ea9…

MALICIOUS

PDF

75.2 KB Created: 2021-08-31 23:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9b7bdcce6cd7d3a5020fa12626b218b SHA-1: 5fd7dc18314fe934254cb1b8301398de049bd83f SHA-256: dad2ca6f23fc3ea9365596d3dfde63dc3594ef38ea6742d433960ed06b46b518
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and ClamAV as malicious, indicating it's likely a phishing or trojan delivery mechanism. The embedded JavaScript stream and the presence of a link farm pointing to compromised WordPress sites and disposable hosting suggest an attempt to redirect users to malicious content or download further payloads. The ML classifier's high confidence score further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://mamtomchabahai.com/uploads/files/files/nugagaletevilalipu.pdf In PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072305118dc2---16744679822.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c727f7b446---zipetebepof.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2a4cf16b210435f532efe9d06a505fbf/jupizugabodaruxe.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/90a2a29dff3f6b4a81c176b1febefd2f/35501298964.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/palamenukopavapopezunelup.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab4b4b85a8---74709002522.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/zinomalazenixegimofopasok.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/21268598560.pdfIn PDF document text
    • https://hoongnau.com/upload/files/pirivubamuwenosekokapag.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/selatatozezetozapodun.pdfIn PDF document text
    • http://maksimetall.ru/files/42550035771.pdfIn PDF document text
    • http://seamacros.com/upload/file/lojumogivijalogonasujapi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aac5a4651---91923819893.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3155e0e20f---84141344139.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/mosupoxelomejivenovodetax.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/37384031412.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/87469447937.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/11242500991.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ofmt05udvrqesmm8jaisprmkbu/13868799644.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/zoxoge.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/66800820142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+energy+bus+pdf+free+downloadPDF 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_off0000bd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 10988 bytes
SHA-256: bdd6c9b912b9016bbd05684c4470ee9793aa33e3331e37e11cdd7e94e607af39
font_02_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 18088 bytes
SHA-256: 34e07b03a15fe66d110c9c46220d87a067f90a51a01ae62531f85ab01289f371