Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b43ae8436ab62f…

MALICIOUS

PDF

83.2 KB Created: 2021-10-05 16:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9122b2e65b39e7cf7d050d2b20aa71db SHA-1: 9477e7dee0076290fd9163ae6dd9a977a9781bd9 SHA-256: e3b43ae8436ab62ffe03f31412ec455b7f887e298ecb5da003e09cb23f37a59e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=interview+questions+for+new+parents PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c647c98683---12126078033.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381d186ad07---sukajapomef.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/51695614167.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109040713151073.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c56e8fe99---23145915386.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/mixijatububixuvinilido.pdfIn PDF document text
    • http://3asoft.vn/img/files/kubun.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/75653439729.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458149369a9---zisafodamafi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156776b1da51---96651125774.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/27526455504.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/pepamonibuju.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/46746015624.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/52260965767.pdfIn PDF document text
    • http://anninh247.info/upload/files/buxat.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/33682021026.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/97012276453.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/25300562617.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8953022a---3960471946.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/61055276680.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/neburilimipagared.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/wasenudimirifaxol.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/40775055238.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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 18124 bytes
SHA-256: 436f6c2959e20dae21007333d1906a8dd12359098512e290f000961deba6c1c5
font_01_sfnt_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 10652 bytes
SHA-256: 61f3bb3bec863291d60a08ea8cee02097f8d25ac079fcadcb3b2c8b91152041b

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