Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c21311cea867c3e…

MALICIOUS

PDF

62.0 KB Created: 2021-08-18 07:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6934b00dc176dd4978919da57d68f600 SHA-1: 4f7cec2c00522c66d7c63bed086d6136877bd8da SHA-256: 6c21311cea867c3e7a21f221688a7d7dfd9170a0a1e02d033365dbf520c69405
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites. These links are structured as a link farm, with one specific URL suggesting a lure for a 'free budget worksheet excel download'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9533

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=free+budget+worksheet+excel+download PDF link annotation
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/ef081518c4d3d1deaf6ddea4a726dcaf/93883589939.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/sunol.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e0b51213e---lulupen.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/ledivibipelor.pdfIn PDF document text
    • http://hydrem.ru/images/file/zegejunasamusugakoko.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/losopaxo.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/nuture.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/reluvimex.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/575b44894b145ec0aa9737de6121879f/didigilizamibelefix.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/9dbc8a53093e5ec1d152a3683bcb6fad/16904397891.pdfIn PDF document text
    • https://7gking.tw/upload/files/41228999900.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4dcf9a2c16f2402e9ea3c6481fc5a8c5/gegejotusetegelorixez.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/efb5107da66847fbd640a3907436d565/xepukifofusig.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9lruvau6mspvhpef5abguj27kl/wegefitixuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2cddc9f75---raturajedisi.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ddda328def5eaa07bde4da93430b251c/38741692577.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5b43f6191d9afdcefc57c1e584efe413/mugin.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0ddf3d054cc345af25dc23e0a54de158/tejitirom.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/geferepaki.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/milevu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c447a441c79a5fb795c3eef5c1a5feed/20684971860.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/jenepizatasonepawoz.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/ladojekiwuzozolire.pdfIn PDF document text

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