Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f5ef9447d5b6b1…

MALICIOUS

PDF

60.9 KB Created: 2021-09-06 19:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30921af50f772c5ecefbc2187f7d8ad1 SHA-1: ffc76b7b85e31530925ba2c289a01786564d3585 SHA-256: 84f5ef9447d5b6b13b7fa412be882fe8d116aea32755c08b81c321c1daae2305
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate it's likely part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7265

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://inwebjor.ru/uplcv?utm_term=dna+chemical+structure+pdf PDF link annotation
    • http://fredericjean.net/oplusco/file/1679668476.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612343ffdad71---74540089775.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/67f6a944bd8eb5a9e57cc23df8231e6a/59749707009.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/nomenowogedanipixokix.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d106d64f46---satadosasutubatek.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/viloguse.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/5389735102.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92658fa1e---fevilezita.pdfIn PDF document text
    • https://telenovella-bg.com/files/vilexupa.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/fijarejolono.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/88453931378.pdfIn PDF document text
    • https://anfauglir.com/images/file/logesumexovegiliw.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/86967015335.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/91a0b532e5d5fce8825d23f901ebbd1e/dubirejesa.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/25582009218.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ccbc9fb44d8dc788ba09c9d6e011c4eb/doragukiz.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/26723759580.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe106630df---71775924254.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ijbe0dp1onre3q9ro86aalhev3/34580898232.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/bivisitemusupije.pdfIn PDF document text
    • https://anfauglir.com/images/file/fetuwije.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/denubipef.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210810_1B106AFE1CD381F9.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_off0000c548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC548 10868 bytes
SHA-256: d6af225c8fe491cc625e20e65419cf9765912abcec587ec22d4e568ff13f964f

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