Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af4f8ee4fcaaace…

MALICIOUS

PDF

67.9 KB Created: 2021-09-26 07:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4f158b59836901a38dade1406ab37277 SHA-1: a0e4381061802331818b8bf4417c1aa9fe828305 SHA-256: 3af4f8ee4fcaaace3294259c9d8e8c82ac647a893676c898152ef9d225ada2c7
154 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded content indicate it's likely exploiting PDF vulnerabilities or using JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6872

Heuristics 5

  • 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
  • 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://luminex.pl/upload/file/38458619902.pdf In PDF document text
    • https://szallas-karpatalja.net/upload/kovale.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/xupewurajumukil.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/5777986455.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/23852926725.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/9925112429.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ffa1d11a---41511893253.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210918043302.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4104544bb---jexafevasukagunose.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/24023938424.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/98783228457.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/togomuvojomofemumatet.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/bunevanenijivajiposojox.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/fe54eca69541ee1ef13e079f2f6f8f3f/45652689348.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/vivewoxezuliposu.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb41818d2---wufolo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a69a0b71a3---86190752240.pdfIn PDF document text
    • http://youil.org/userData/board/file/31061499568.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/daloxubajuvuzedibi.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/nagafebi.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/livizonujepaxo.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/210d383b8dad2fa02fb4e90a02519236/lufoterelatuni.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142219e03ed3---jadena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=actualizar+android+de+huawei+y210PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF26 20560 bytes
SHA-256: cf18ffc9a869c18a9d3d16ed9fb0ddd744c287a02a53669359fd172697741c38
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 10932 bytes
SHA-256: 525dae142cc96a9806429346f32adc0419bb1d6776af17ab453a717682f0dfda

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