Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4cfe58f70d1be3…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 01:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1505ed30293eed414d8bda329beee4b0 SHA-1: 2d7fa87d7dd370f88e4facaf69ffbd8a2b0cbc04 SHA-256: bf4cfe58f70d1be3ad6f676abbd7383caa309518cf8e04a52cbb1418ac11cac3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://modelseafarm.com/kweb/ckfinder/userfiles/files/jagugotedigodofuvigutima.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/srvj9q4mhtgd2mcdomn190oqp0/domuwekowugisajegub.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/likemuzeluwenuda.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202192527451122.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd854d220---87166273404.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/7316354396.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b58e789165---60897671985.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28906199744.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/fokuxivavi.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/fimuraginux.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/86125632442.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/pekodirewevabix.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/98724353001.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b16fcd74c6---11416545742.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/rixokipebumewiwevip.pdfIn PDF document text
    • http://greenld.com/userfiles/gidezagag.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/9537896029.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/topufeli.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/31352395291.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141d262000e0---pepinoraditisa.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/38662862727.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/65831198122.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/48b0f009e4aa68fdfc72cf8bc20c75a8/93594538488.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/88569041321.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/99674965358.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109180549337843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=robux+promo+codes+2021+mayPDF 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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 11128 bytes
SHA-256: fd626d32d16e8c04e825ac9eb7a8a4e0f887de36846f1b2ac348ddc109eb6426
font_01_sfnt_off0000cee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F4 17268 bytes
SHA-256: c8e863db440c07198ff949eb05a2797bfb75c165bbe09f8f7402038a203734d6

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