Malicious PDF — malware analysis report

Static analysis result for SHA-256 aadb0e050f369f13…

MALICIOUS

PDF

115.1 KB Created: 2021-09-05 16:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d8d7ed4724795523e59df6f00620dfe SHA-1: 43cb84332ba9a443864b0c7c6d5533cc7af38b36 SHA-256: aadb0e050f369f1334fc13aaa0f09252df7dea0e6cb4eddf2fdb12958fbaaaab
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. This technique is commonly used to obscure malicious destinations and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9028

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://vgi-vn.vn/app/webroot/img/files/mumajelaberef.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feb45a74b6c---2401190659.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/h0fr91gcs659cuvaqr4ec814e1/31308304180.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f80b5f403a168e7f0ebd28f33c83c2a2/purogutuduxibowuf.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/23618550401.pdfIn PDF document text
    • https://panama4d.com/contents//files/42327208942.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/gisigibinavagerapiv.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625435476.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a27cf4a9810---xulupe.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/67432a686e654227a1464bd7bec73243/worabetuvakipuvekupimusi.pdfIn PDF document text
    • http://vodova51-53.cz/files/46595232385.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/t70q9pkhb4cn6kcphm76gif6fo/pulufutimepojul.pdfIn PDF document text
    • http://www.celso.org/download/98427009026.pdfIn PDF document text
    • http://e-hematologica.com/users//file/90810536980.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/zebasuzuxexaroto.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160771915ed997---penikeraludimirovej.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///kedebepanewulezodunazapo.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/penireziwovu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2290bddf---49913074087.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/71799547431.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d21957fb3d817657c81933d9fac4a3e2/rotefuvamasezopunide.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/xavitifuxiveturaludiridup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=activity+diagram+for+hospital+management+system+pdfPDF 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_off000196c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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