Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee4a157eb4f31e6…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 21:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e191d5b8dbe9499440a031cb3abd088c SHA-1: c0470dff730328379a70210da543e4ce165b4321 SHA-256: fee4a157eb4f31e6ec3544012d5a0bb75a1507733a8a577b4e21b58c57c5b502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=gran+turismo+for+ppsspp PDF link annotation
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/469c87a69d2f8a7f536ae30e7345c657/88129245321.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/ragupozogib.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/53192691990.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/kekuvopepumakikulazoneras.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161374d2d10d7d---76016584204.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/84642878638.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/60905515401.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/21030578126.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f21f39fb7---wuxepex.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/37690735224.pdfIn PDF document text
    • http://519pf.com/userfiles/files/45229198787.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/diduxaduzudogej.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146c12901492---gokoda.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/pijepovozukuxejodipunef.pdfIn PDF document text
    • http://mylodge-naoshima.com/48122288949.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911225422598642.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/3167656791.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/94528821546.pdfIn PDF document text
    • http://jump360.co/upload/files/20210910175659.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/romozuduzelu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16146b88eed373---dizopavigadovi.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/77213811985.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/072e10c1508e7e01492b97a13f298780/lokomuduf.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/22653554155.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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 10480 bytes
SHA-256: b2e1d21387519f15a749ad9e4414d03e04181e32c00f6360f76cac6ea1dfd12b
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 17988 bytes
SHA-256: 65409ce200bd0e69bdcf65f853db6e9e5d7a692631df63f8a635b40e1c396993

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