Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c3d725969fc0e6…

MALICIOUS

PDF

62.0 KB Created: 2021-09-27 19:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0172df88237797dbf5f9ec666904db3 SHA-1: 0524b3213a394e3fee851712deb0c2a726ec48e4 SHA-256: b9c3d725969fc0e61d46e326fa5a2ab34d7d9b4a653e2b948014488950ff7dc8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to external sites. Several of these URLs are hosted on compromised CMS platforms, suggesting an attempt to leverage these sites for malicious redirection. The PDF structure and embedded URIs indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2574

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://smidgel.ru/uplcv?utm_term=mod+boxing+star+apk
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/puniwowonabeje.pdf
    • http://martonelektro.hu/files/file/48959092555.pdf
    • http://healhumanity.foundation/userfiles/file/95105288313.pdf
    • http://www.hausman.eu/images/wyswig_images/file/21611106891.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/hma4voop36cuvpmhush470knn2/barelipovomaj.pdf
    • https://ladymamashop.com/uploads/files/202109091520189649.pdf
    • https://sydneystudytour.com/accounting/userfiles/file/kenovesifup.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d9ce9f533---bowetibuvifu.pdf
    • https://associazionedynamica.it/uploads/file/15869063908.pdf
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/208101512.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b66a02d5ecd440f1ed5b6a07589fc44/kutoxolenenezexavi.pdf
    • http://clinicaveterinariacene.com/userfiles/files/70137072036.pdf
    • https://daiichitravel.com/uploads/news_file/sipasemubowitife.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/guzenes.pdf
    • https://bustotoronto.com/userfiles/file/32375994968.pdf
    • http://nenkin-t.com/upload_img/ck/files/8948122948.pdf
    • https://portalbime.com/UploadedFiles/New/file/lofokewifolorexar.pdf
    • http://surestegc.org/documentos/file/13593580848.pdf
    • https://loppisidjupdalen.se/images/uploaded/file/mibezusugodaxufubef.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021090718342873499.pdf
    • https://vitanov.rs/files/15010743462.pdf
    • http://mebelhotel.ru/userfiles/files/27546530695.pdf
    • http://libron.pl/fckupload/assets/file/33584838950.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/kanesup.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613741060ad75---desozuvonirevivore.pdf
    • http://www.urbanwaterways.info/files/koguduzixoxapakotadusij.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4ce.bin
d7039b29aa36fec02e8c626c799d9b4cdacc364c7198f3a1ddee0b0f3f7811b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CE 10716 bytes
font_01_sfnt_off0000cd23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 16792 bytes