Malicious PDF — malware analysis report

Static analysis result for SHA-256 525bd72effc8ef69…

MALICIOUS

PDF

62.6 KB Created: 2021-09-17 07:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10ce7ee91b9058649a3d5a11cc504d10 SHA-1: 507c41b0a97896980b7cb335289276596c209e20 SHA-256: 525bd72effc8ef694284736f0402fdd562e50675c0fea61474954e01240389e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and disposable hosting, likely to lure users into downloading further malware or engaging in phishing activities. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8088

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://laborke.ru/uplcv?utm_term=hackode+download+free PDF link annotation
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318d63822b1---94788625613.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614307b80c0f9---19256871054.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/bupekurotepexofuw.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/12910427555.pdfIn PDF document text
    • http://aimic.com/userfiles/file/mixusumafisoj.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613239ec2aef8---sopop.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/naranivuwatoveku.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/xiwelijajuzaxikusujisupe.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/lajojimefev.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/84399205369.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/42586519976.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/52044261972.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/zoburoxusewukilunafon.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/96322880165.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/38906143160.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/zibuvetikulavol.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/ripadixedu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131471fa1da1---47462231797.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/60851786290.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///mebivufizuxuzonu.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_off0000d00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00D 17244 bytes
SHA-256: eaa3ec1895d74dab3cb2705f60f6401cdb88225ac241ca84dfec5e9202f91ceb

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