Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a4ad3d395209e6…

MALICIOUS

PDF

74.6 KB Created: 2021-09-04 13:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 248f269d3de370403352df9e40cf751c SHA-1: c9744bf53cc56b89360ec0a4bbf7a718613124d9 SHA-256: e3a4ad3d395209e636d63f509bcb9bed54141379bc22b70da94ffba677680e97
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of multiple external URIs and a link farm heuristic indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://fleuriste79.fr/ckfinder/userfiles/files/fabevurasopibaj.pdf In PDF document text
    • http://cameranichietsu.com/luutru/files/sevedinosivifetivixenofe.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/dotugenogowofatuzanitup.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6490bc0178a0b8b00530b229e1c3d6c3/12699154579.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/nuladorulasabinu.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/86642889478.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/avf1am57cn3u70fq9bktr6vmj0/60732374327.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/80956366083.pdfIn PDF document text
    • http://digifast.cz/userfiles/48799690932.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42b085f41f---35260271262.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9143e44e---joserebu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5805b7ccb6b7b67e7b22c6fb3a312647/wuxalegoko.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea1a3466ac---85496018368.pdfIn PDF document text
    • http://rld-carbon.ru/file/manofovijitinojevi.pdfIn PDF document text
    • https://manenshop.com/upload/files/50566320136.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/kepipasifin.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/41321643923.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/kumuseb.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d347df109---24942358351.pdfIn PDF document text
    • http://rubensova16.cz/files/file/45854567031.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/2787274393.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf69ada1ab---40832821130.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/webalibav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+normas+apa+sexta+edicion+pdf+gratisPDF 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_off0000c157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 16680 bytes
SHA-256: 0ef03b805582c8ad86c75fed712523179eddd7e7cbedf16730fcbbaf7b72c252
font_02_sfnt_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 11020 bytes
SHA-256: 66880338f74d7d16e12a74114c9d4ae3284a87353c85e1a0afbcef9e1f60ce1a

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