Malicious PDF — malware analysis report

Static analysis result for SHA-256 198f91089d2e7c68…

MALICIOUS

PDF

62.5 KB Created: 2021-06-19 02:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 85d692d860b5e11d214327e934db740d SHA-1: a7d1d89938580af2b6ac088dfa578b7b46d87a26 SHA-256: 198f91089d2e7c68e32f6ecbc2b79aceec937db15abf7fe5d1ea808afb431447
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://chcial.ru/uplcv?utm_term=new+tamilrockers+site PDF link annotation
    • http://usaoxin.com/userfiles/2021-6/file/rekojerupobojugisodaro.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/23980230116.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/51bb1093f484af7c527ce6ef0f685e8e/vinud.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/b0e3853116203310013cafa94a3f3a4e/lutuwunakozemasizirujap.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/42931643656.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/72155418060.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5799166568bc387527c5235219fab9e3/tavogiwazatupivomamupeteb.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160804859400be---59091595475.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb1c558cf4cd4ef1d82f9580744f1b02/peretafiganodonowiwat.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/1946b9ebeba1491f1c518d34b5b15888/jisuwasokobimowo.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/94022580894.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/65604307321.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768929709e9---fetosupelupojawajisojebuf.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/58bf255d96946890d516e9bcd703e0e6/bomupiwanuf.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/98940963106.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 5072 bytes
SHA-256: 551a18c46da3a92a16b47dc70b2f20158ebd6a9fd1d9a5e828f401ec0d441dc6

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