Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c03915f1b35249…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 07:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a78a522426fbbd36910f140b2b011981 SHA-1: 6ab8acda35bd0130c9bf09afd592ec39d96c04a7 SHA-256: b7c03915f1b35249250d6bd4db397fd75366aff47c3a969419c2d3f320936316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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.
  • 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.bufolari.com/public/immagini/file/66732624214.pdf In PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/86554398953.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tefinepasonusi.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/dawofe.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/58287262058.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/dozodolojujiz.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/48589998825.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/5620894536.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/v83dgd3hl3f81qnelp0kh4b6t1/nonagetitipip.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/nuwamasotikamo.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/13701026596.pdfIn PDF document text
    • https://music-group-store.com/upload/files/jurejenofibupanipu.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/21444645829.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/gavutegidakulogapaxo.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/defepusujovil.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/ginituxu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874fe6c8971---58402081605.pdfIn PDF document text
    • https://o-dance.com/upload/files/43418002505.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089a32201651---63203744844.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/28688688976.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9130e6638---fabenajesarusidoxefara.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202108310253113927.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/56ak0h9sf9hsg9ovp76sev55se/89502589810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=surface+pro+2+specifications+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CE 16024 bytes
SHA-256: a60d95d0fa2d15d0f56efe4ebfb7831e19a36508d946aef16617c29e342adaf1
font_01_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 10860 bytes
SHA-256: 9c63a65ebbbcc9f1a82f9432bcfe5f1e170c8697f0c2e03209743e96e6d29cd0
font_02_sfnt_off0000f5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F1 17836 bytes
SHA-256: f34a52ccaa5d3e41c92a3d69a0a64e419eccf84eda4115c2a0c96129f7e16643
font_03_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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