Malicious PDF — malware analysis report

Static analysis result for SHA-256 437e9af1a99b9b35…

MALICIOUS

PDF

48.4 KB Created: 2021-09-30 11:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a38f81fc09aac9aea75252473cb8b562 SHA-1: e91d71825287a0793fc56be44e226591ad3b0f5f SHA-256: 437e9af1a99b9b3570b1958e590ad901b4a3b50f4a85990f6190493bfd06988b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links, including those on disposable hosting, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7906

Heuristics 5

  • 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
  • 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://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e96f943cd---26941557095.pdf In PDF document text
    • http://agroanaliz.by/upload/editor/files/zemenekerupavodudos.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/fivupijebusapuz.pdfIn PDF document text
    • https://andhimazhai.com/images/files/50790493865.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/80188971695.pdfIn PDF document text
    • https://maisonforville.be/documents/file/48756448656.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614e72101e31f---35291484297.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wogizitijijido.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/8925259726.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/wejupimipuv.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614fdedfc6030---lomudujuminomilorone.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3f8fe7bb6---virorivajoviwo.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/vadetunirawoxovojujapuzu.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/jiwitemokigejopofesodi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/59fb23447ec02771682b1a4c2db9942b/73276976339.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109140005567169.pdfIn PDF document text
    • http://contelex.it/userfiles/files/35912858573.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/mafotopemidututuk.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/9009516809.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/vebatenupegosotuses.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/bozajose.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/nupoxivunarunudutalolaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=samsung+s3+mini+charging+portPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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