Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bb40cc8b9a4987…

MALICIOUS

PDF

141.4 KB Created: 2021-07-30 14:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88049d942254762c6dea05adc126f05e SHA-1: 8b0d241f68758bdb1d3d4b59f4f8d54cb4d4113a SHA-256: a6bb40cc8b9a49874c0dc4fbbdf6afc36d54f5c00ca9be7d61270111f33c025b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell, likely to execute a second-stage payload. Multiple URLs pointing to compromised CMS uploads and disposable hosting were extracted, indicating a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e03r515jvbpq3nqdll5prtbrd1/gigupaduk.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fbeb3750e9865c15b770b168a921755d/321642744.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c300525e28---nufowopaxo.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/49385494295.pdfIn PDF document text
    • https://ever-progress.com/upload/files/16014079224.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/banukunulumuwuwula.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/puwutuzudilusosusa.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/30420719804.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca1ce9d2b---ketuwovorerozonopokoveki.pdfIn PDF document text
    • http://szpk.hu/_user/file/28147712075.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/47255673663.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/29834101606.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccff2bcbab9---88843204822.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/rivajudujaw.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53540e06c3---63438166947.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66b6724c25---25152892552.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wokosomex.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qm9d4acm3j3duptfaa3thq9dn6/xunupifivili.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/2362840705.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/95775034571.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/9494646920.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ed2bed0a66056a0c0cc10ece0cd5c588/68548209043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+edit+clicker+heroes+save+filePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A776 10704 bytes
SHA-256: 37f244dd7db3624b8b9eb2bb1d471ac9650fa3af31b898a50e1e014c6d33bb98
font_01_sfnt_off0001c02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C02C 18660 bytes
SHA-256: 8ca4a2adbd311bf9c54eb355af5caf4ce72f640d0bb8c0e915d23ae9e6694042
font_02_sfnt_off0001f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00020944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20944 8932 bytes
SHA-256: b948f455f7af10328f4c6b4124e45414f2d6867ac3e0edd39a46b9fc993b8cf4

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