Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bad7da4050ff6a6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 00:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ef288c0e7657c8b2f64afc15b6ceea8 SHA-1: 2c62be2c86556da01c5202db9c54980c5826587d SHA-256: 5bad7da4050ff6a620f37dde297474878c6b524bd5bb2b162680e447bd19037f
196 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic to trick users into executing malicious commands, likely to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 https://catamma.ru/uplcv?utm_term=how+to+find+your+wifi+password+windows+10 PDF link annotation
    • https://shopinhome.com/ci/userfiles/files/82983889479.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd90e9e6519---69452709441.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/mapakagiv.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/11113430111.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d611a2d316---9161194421.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/51730993808.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/vanujijobixonakesiluxuv.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/wunozixifeberizizazanari.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/91221732593.pdfIn PDF document text
    • http://nprofit.hk/userfiles/49259941557.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608740f689cd4---33326392362.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/zofujakesoguwunakapeb.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/404929330.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/bojorevezenidilidaxe.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/39391830674.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/ridepitenapinozivamunu.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0cbek1ktglb9913l4vq78piet7/82752136856.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7380c76603---35137376901.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e6a5c9a330b6989b164a735bfc03155e/rodawozufizuduvu.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/vupaf.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c7d28da64c---4789721128.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e3ce7dd8---15736344254.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-8-28/20210828020643884775.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88bbe01d9---64937002251.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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 10780 bytes
SHA-256: 17e017534bb187433ef6d1130985db6c384f7052d928570fee0cddb8d9fe1f0b
font_02_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 17504 bytes
SHA-256: 485262e6a95c0fed20a5652de90547e018517dc097d3ede5f3954491c55cc165

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