Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70a792ce8be3d8c…

MALICIOUS

PDF

55.3 KB Created: 2021-09-03 22:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57169ec08948aa02ada9843c65fb599a SHA-1: 86b846a5cec0546f3780105e616307ce23a2e831 SHA-256: a70a792ce8be3d8c93b372776373344305f81f6db9bd94e1cd552f72ea6451bd
154 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the use of non-clustered link farms on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6108

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://assessmentinsight.com/ckfinder/userfiles/files/vosekupiwufaduzijetekekef.pdf In PDF document text
    • https://slezanie.eu/userfiles/file/kunan.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/witofasuzebuwolokoxub.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/93151515050.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae218e74840---62070093532.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/95676471282.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/74a972d280a6c330d905f598b9a183c2/fixulubu.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/xubimilifafixi.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/46960829369.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/10442556574.pdfIn PDF document text
    • http://agrion.org/upload/fichier/98529377025.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/85da68985fbe6192cbfebc6483660454/14817935733.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/28067001153.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/kanilup.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d427a3eb52---womezutikovomezuxobabim.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0a80c11b---ruwewovupo.pdfIn PDF document text
    • http://www.520amis.com/upload/files/jisosijagipew.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc8ae65723---givofakabedutiletafe.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/1571874810.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/likopowuvoferiboxuka.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3966fc55a3aa613887bcae0a88d3aecf/35684242093.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8019feed---pusopenomofu.pdfIn PDF document text
    • https://lemanssrl.it/file/92634571646.pdfIn PDF document text
    • http://feast.to/upd_file/pazuxoxolukimabuwipanawu.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/61034746442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=figurative+language+worksheet+3+answersPDF link annotation

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