Malicious PDF — malware analysis report

Static analysis result for SHA-256 461742e3c0410b4f…

MALICIOUS

PDF

75.2 KB Created: 2021-10-04 03:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e028d3fcca607b96071ee66127dcdf5c SHA-1: 92f01702e150505c21db7c4e09cf8f6d215d4f36 SHA-256: 461742e3c0410b4f2f241d87d8a6147690f9aa501a2378ebb14bf750739735d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1631082325/files/pasenofosiwepo.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/859288ki34trml0ubkfme0im91/fozavegat.pdfIn PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/dewupifesodovudab.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1ffb58b877831407e570d62b1629ce7b/16616359302.pdfIn PDF document text
    • http://whatdwellswithin.com/file/janonitujuvuloposeko.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/16320532436.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/62730607624.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/xubitivow.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/68484901339.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/42754530147.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/jinepesenakonemibalipomas.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/65764987118.pdfIn PDF document text
    • http://santehnika34.ru/images/file/tilamemumatemunonerodutaf.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/58970789454.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/bekisafubi.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/vubovivenulole.pdfIn PDF document text
    • http://gro-felix.si/uploads/21313891053.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kufimi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/01a1eee2348b3f25ea8d4d453cdb7719/kifin.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/lidokisi.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cn5d4q18hi5mco1od53qs8m19p/jifonatuxixam.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/jumanek.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/85976668745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=windows+cmd+list+file+names+onlyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 10728 bytes
SHA-256: a96b23b9c2f3012eb0c5bbf1509337054ab279ac31c874b65ebb9fd27ce9554d
font_02_sfnt_off0000eb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1B 19412 bytes
SHA-256: d9ed3dd54672975c4e05911758e61f85050b1692d60c1a6770b28dbfe4fa47d6

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