Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca1fff561f005ad…

MALICIOUS

PDF

83.2 KB Created: 2021-08-28 21:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7221c23737a3ab9b11dfedb482f26e61 SHA-1: a204439f95693f79da7b6641a8b07ce0a0e28a37 SHA-256: 2ca1fff561f005ad39004b88967c7c9aeb400c68e9797e967753048f34e6d973
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://beamstraffic.ae/amb/userfiles/file/bajudifeburavudosivisev.pdf In PDF document text
    • http://chipgene.com/image/files/20210703_233601.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/49160846309.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161203e2236c54---76245810280.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/72ddb92ce44ffd891e7abdf83f38bcd2/lofaguxepawakitegasadiri.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/92976790592.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/terelinulurikuga.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca74a19ee5---90878214362.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/najibuzalodojusadukap.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160870afc69e8e---piviluvekoxelewazotosexe.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/3e220fe536deacba13a6295f84f02478/37072874842.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095af2bab88d---sezufofujepugenutupemoz.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/214c08e2f58b096f4cebd578eb840957/95890801669.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/dakizotevevexefuw.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607170d559f45---rujigadal.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5b221e6fd57a1a33eacc5bd5ddd0fcd6/80433548576.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/nosonim.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160829c4386c3f---63761871890.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/jetaraze.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429477f664---92592269905.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c02189f5e059769641d4bd036b6bb179/gitujodizuwatemuxuzaduwe.pdfIn PDF document text
    • https://tjpapigroup3.com/contents//files/faneb.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/44803263101.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5ba9add724e1d46f803bdaf4c694ba9c/97117772579.pdfIn PDF document text
    • http://billsky.ee/files/file/forerebogobiwuluruda.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/guzikojezapuzaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cow+mountain+ohvPDF 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_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 10208 bytes
SHA-256: 9ee6971337eb56458b0a7f3e1e249a3817e46ff859d3bc0bb59ab1745bdc4824
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 17096 bytes
SHA-256: 4d5cb5b4475760647daa59dbb3b8d459ad3408f52d0cd881bf266b5f8eee2330
font_02_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1