Malicious PDF — malware analysis report

Static analysis result for SHA-256 157531083a25ffe9…

MALICIOUS

PDF

80.7 KB Created: 2021-08-15 09:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d05e8510fd330be0da790da0821ba03 SHA-1: b4b61b471041726bcd8317397fb8c9f71218c984 SHA-256: 157531083a25ffe934f94a79cb8d6860bff019c6c093a7b99b300af8d7782750
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, characteristic of a link farm used to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5648

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 http://tksvolga.ru/userfiles/file/89975160768.pdf In PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wofupanopeselak.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/buluxilugewanusujeda.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09d2ec248d---81739461545.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/lufibanalora.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15c703055d---98197299764.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/sogasigutisuvab.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0391d30f1---gatotenenogidozun.pdfIn PDF document text
    • https://umartravel.com/files/zakexejavopivujoxewigol.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e1234aa70---nivisaw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087818029fd4---88382565226.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/39674672304.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/67882801757.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/98962587435.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/kitubaxub.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/naganamavufafivorina.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/dukexavukituzuze.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a22a1936ada3172e27f6d586172e9cf7/90177031101.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/201bbd7d6f641f6a9973d80860ca311d/95439058408.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bb23add76---finowateja.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/gedovusik.pdfIn PDF document text
    • https://usis-consulting.us/uploads/files/nitam.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kugopavijokofub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ejercicios+resueltos+factorizacion+de+polinomios+3+esoPDF link annotation
    • 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_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 19444 bytes
SHA-256: 187079c06f364bd60c92045f268991844b65ac1ff93996b1bff3637e064c7e39

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