Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f4258b294565a8…

MALICIOUS

PDF

51.6 KB Created: 2021-09-05 15:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24b416ff4098c5e19fd2cf6e7e10b154 SHA-1: 3c48afc03f86386deeae0e376ae0cf3f0b847f2b SHA-256: d4f4258b294565a8d4c59a2723491bd00b5abd26013726d2ad34649cd902edc2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to potentially compromised websites. The PDF contains numerous external URIs, suggesting an intent to redirect the user to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7121

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=gassed+in+the+gulf+pdf PDF link annotation
    • http://alde-pace.org/ckfinder/userfiles/files/mafolilurujemutekodiwo.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/liwedekutitu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de47784b6---topabutifuvumejep.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/minetuzifabax.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/joborujipemivenefa.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/38751718297.pdfIn PDF document text
    • http://3q1p.com/upload/file/2106180409234238763t6roo62i6km.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3tvu937im898u6tgh1aedgju4c/zosujawula.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210601215258.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112ca3b9bb56---pobaduzisigaborid.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/zamotovenoli.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/99112796004.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/60763466054.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/webebudubu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b122d3e7878---nowerux.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6f141a7d---jeribuzaviwekegotivuwube.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/20192073570.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/14468305774.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/raguvituxevitemimozet.pdfIn PDF document text
    • https://www.gcnaura.in/images/uploads/files/92432703780.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/disemonugopotukufudale.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/mivadarozebitujosureguj.pdfIn PDF document text

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