Malicious PDF — malware analysis report

Static analysis result for SHA-256 92390151c39c2874…

MALICIOUS

PDF

55.4 KB Created: 2021-09-08 05:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9709491364e5a65b1ddd5e34372123d SHA-1: c841d6566ea4de2a890d37803d6eec4330ef8b27 SHA-256: 92390151c39c28748c6a5cb7e6ad389758f7edf5b85f5a46146265d7419e6cbf
174 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, likely intended to trick the user into downloading a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs and link farm structure are consistent with a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7420

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=download+merge+cube+pdf PDF link annotation
    • http://reliancefla.com/admin/images/file/sazudofejis.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611d118c5dc63---99880090144.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/jiteziwewovumina.pdfIn PDF document text
    • http://hifi-markt.net/kunden/kronhardt/ckfinder/userfiles/files/rizotamexot.pdfIn PDF document text
    • http://allasclub.com/campannas/file/80496996354.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b608fbdc38071f8d2d45b651039ef97b/58033271403.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/90754705345.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/25c6924b91430b1782305085576702e7/lumirodukas.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/semaditilogopabu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/20894202193.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/22554170330.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/83952355994.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/bozafus.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e7a16016---nijaredasizumunafe.pdfPDF link annotation
    • http://thegioituigiay.net/uploads/files/vigivogeweb.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9c9dd54a---niribaxut.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/napetip.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/73568781477.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gav662p3gq84r1fos5v80o1o7m/95123646718.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/tilogasagi.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/mopipiwepunipasaru.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/vewasam.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/nuvevune.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/90301633227.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/14169970410.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ee4fdd67c00194182cbb0d4519c2f55a/19503891011.pdfIn PDF document text

Related samples 8

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