Malicious PDF — malware analysis report

Static analysis result for SHA-256 002acd5f2a118229…

MALICIOUS

PDF

87.0 KB Created: 2021-08-01 09:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: f87895396d43201a5e300688eccc0a85 SHA-1: 11ad8905a181f658b6141c31f3b658306dca7fe5 SHA-256: 002acd5f2a118229998d16ccf6a6905f18bf11f9b4cd62bca54a5fceae047bdf
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bnbcostaverde.it/userfiles/file/32632318088.pdf In PDF document text
    • http://citadelcaralarms.com/userfiles/file/vunofovewiduveragerar.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d30771a0d584776fc2dab114f93531b2/91981386659.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/11975432370.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a502a7a9fb3---89476286588.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/tesiren.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/karomomaxidojijaka.pdfIn PDF document text
    • https://songhong.info/userfiles/file/66677563294.pdfIn PDF document text
    • http://babamoleskine.com/files/file/tutaxegajimupikebowezasor.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/87e14a08b95a08bedcd9cf811c43e12c/34803508247.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/56084748051.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd608f2e9c1---vapuwizuzesidimulud.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/wudigawomorazozetaditabi.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/38583202536.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/f11ea2228baf0d61f78eee0fcf4b6699/xapap.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/ruwurawujosiw.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/20362043036.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/23249355174.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/wofedoxexafibafagupupubo.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/jirukula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=biology+quiz+bee+questions+and+answers+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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 11372 bytes
SHA-256: a62b16e7430d8cbaf11b7c70049e53ea05295dd9973add751b5c8a618edeaedd
font_01_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12071 17576 bytes
SHA-256: 9850bb7b9eb171775f9a492863db1a7606d159b69d0c49ace6217f4510c8cd79

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