Malicious PDF — malware analysis report

Static analysis result for SHA-256 8037848d8f9f23b3…

MALICIOUS

PDF

70.2 KB Created: 2021-09-03 05:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26bbdd7a2a47059f75dca0c34bfda66a SHA-1: df248147220f966625cc25c6203d791f5b3c6524 SHA-256: 8037848d8f9f23b34e267b2bb4a114b2b1d49f54caf08a013bd04ccd7ed2857a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO manipulation attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7541

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://wastran.ru/uplcv?utm_term=meccanismo+europeo+di+stabilit%C3%A0+pdf PDF link annotation
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61540077584.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab25e426be9---banijazelufugudijenov.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071303202773499.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/43503780547.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/77258842764.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b7e277a01---dusuvi.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/gumutixotoronud.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d9c05547036b6635144111b3653ed7e8/64063541452.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/sawopexomi.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210513085929.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/64295468898.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/311d75ea36595c077db5a8171113407f/99376748228.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/de6343359ec02b634067ccc83888d109/farovanatosa.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d67c0e8393e---xuvufefixunega.pdfIn PDF document text
    • https://emprenderem.cl/files/28045005580.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b053ca09c6c38751b86f9fdd23cc9a75/tapumizixokexanujaku.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f92819260---nojopejobopovikowikodixaw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3c9fd61ab3d4a1d08655a4a5dec1295c/menixemavusebagot.pdfIn PDF document text
    • https://peterdegendt.be/file/defurutinojojowi.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d76d6ec3a5a65b161cfe6e48bc469206/97183406089.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/37120040899.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef806aebaa---disarotosufunikarafaki.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d780644cad8---disujetakuj.pdfIn PDF document text
    • 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_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 11200 bytes
SHA-256: 5d2858e4c9880d11a776adcef268927dbc1ee600b5fed887cee533e73390c3fc

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