Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf08eba72da749a…

MALICIOUS

PDF

94.6 KB Created: 2021-09-12 10:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7da3349b43e078bcfb11991c440cbda6 SHA-1: b4c5a07892595522d991acd2061989608f8336ed SHA-256: 3cf08eba72da749a535e58dc0f487b871389d538d4ccafb357943b5f1c2a2956
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed multiple heuristics indicating a link farm hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware delivery, aiming to exploit user trust.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2938

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613d653fe789c---fejixurekajawufatoxurise.pdf In PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/3635452911.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/nerufidelixoxidikebugofu.pdfIn PDF document text
    • https://titishop.co/upload/files/70143519498.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a9f8ecf0c87712cb098be53d6eec6625/23880233544.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/boxutagadisowupobapesif.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e29cad64ed72cce9c0aa3cf64deadec3/94567458532.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/60366097772.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/42408308892.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/23502036424.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2865638f---zefubigogipu.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/68982533767.pdfIn PDF document text
    • https://netlandschool.cl/files/xijowilapigipo.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/75495531889.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/gipekonivapomijamawokadij.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/87612582671.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/fukur.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/89444743072.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/22701381104.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/kibefodogi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133293caaaab---fapobidefutuxowaga.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/38677779535.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/mijitagiboxewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dynasty+warriors+5+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 10400 bytes
SHA-256: fb63eb7e69a85e824562660b4012bedb29ecbceec8470da86d8547780209c15a
font_01_sfnt_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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