Malicious PDF — malware analysis report

Static analysis result for SHA-256 6626b705fa2cde87…

MALICIOUS

PDF

67.9 KB Created: 2021-09-20 04:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcb75fcd0dc33916977848397e98cda5 SHA-1: 8c9fdfb9ffd6446f0567b0c9083ba5d6f3ab013c SHA-256: 6626b705fa2cde87fd4e56f20299731ad1d9b9e69fb07150a04d9246ddb0ab2f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to external sites for phishing or to download further payloads. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://paroles-vives.com/ckfinder/userfiles/files/65780317790.pdf In PDF document text
    • http://hooleihomes.com/cms_images/file/guzowewulopibugekorumesuw.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8fd8c6110209be689c3e02d297cc2735/64652505459.pdfIn PDF document text
    • https://norservis.info/files/files/29665928553.pdfIn PDF document text
    • https://pindimana.in/uploads/file/61676397719.pdfIn PDF document text
    • http://recviem.ru/img/upload/60590395460.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/sorevikidal.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/gugalifovijoxanofil.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/kesebumosiralenifepex.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/88563415657.pdfIn PDF document text
    • https://novsport.com/content/File/wamax.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/fupin.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/27258297203.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/47140436482.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/42322224155.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/42287042209.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/dibozijujemivazevuwop.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/5950405487.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f43e60b1af---xinusuzukolivufilubarenad.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/83327327896.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cfe3aa7ed---mojaxefedanegotibufabaje.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/numijekudafinigoxujasowir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ixigo+trains+app+apk+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_off0000ae06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 10664 bytes
SHA-256: cdca508879dd2b66b352e76d762f5f8ccf05a26b3e1691f51dd2a328f7adb193
font_02_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 14316 bytes
SHA-256: c8fac2caf0c0463e05d2efac2563a925cc380a090949183d3e7f902931d271b2

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