Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d3fd690e02ab23…

MALICIOUS

PDF

80.4 KB Created: 2021-07-28 02:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f577423696719f8212451746965d6b56 SHA-1: 286f8c27d8a99201e24dde82d7f776aef7ddf372 SHA-256: b5d3fd690e02ab232622f6e7ea837a0c1984182894028306eba63e53b65d18ca
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6637

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://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/aa9f5659253b6e1d016edbc7eed17323/nifop.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8085956b2---56435338335.pdfIn PDF document text
    • http://kfbi.ru/content/file/88290523371.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/zuzinebimoxeru.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/bixaboputinurisegufopeza.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d1e7f14a349b9f602c1717f8acccd39f/xejawozijosiwexigerike.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/puwujavevuxewanilugulala.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/rde6om3ckuv7q8o92q4v3ldvo7/nikajelifiperikagawikitof.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c64fb11efa6df857506f221bde4ac865/geveba.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de9d7102f4---55067685085.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/zizonereg.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/jqt315lm8263h8f2apcbirnp9u/ginuguwofade.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/80223895129.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/tisadexide.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/1830061068.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3165b08f40a37fea92644a8658363dd9/derufe.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/dowome.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160705ba1f11ca---18724971004.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/941cecf038472af2c5e43e01795baf99/wolibu.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/38508229191.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/tumivunukirozikupoke.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508192752644.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49814677d---vasonidatulu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f4d069d92---79529203262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dondoo+za+chozi+la+heri+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 10512 bytes
SHA-256: 811e519489d358e64943caa9c20afeb22b8a159d7525ff9fbc45f30907e71e71
font_01_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1