Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d874200d1f935e…

MALICIOUS

PDF

62.4 KB Created: 2021-09-07 00:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e115a3a28fc790a54f1d733404e4e5ae SHA-1: 37e295d49b0bccd6addeb21041a4ee4652a5c6ab SHA-256: 82d874200d1f935e3870c9d5efa27fe19cb7ed8f9d57f15670dba1afe8653fdf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, but the overall structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8029

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://medvor.ru/uplcv?utm_term=remove+watermark+pdf+document PDF link annotation
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7e97a0fc---gesixidi.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/rezatuxobuzizizemetise.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6408d18f4---fipaliwem.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b1c725e66aa9a816067b51e392a6e202/tevaravoxavubizufuziko.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612773cecf1fc---lufixojozegoxabif.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/noxupufo.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/piwusilojazew.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/madedabiluse.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/73931229835.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/toligu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609839e760d62---3703031307.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/d2lkqh4oohmdoh2u8239p283c1/72706809998.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/69142846586.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xibar.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/33ca45744d8495507a6ad9b714a8ee67/pemasozov.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d32a2817f2---vikukonojuwevuw.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vikuzirilakaparonevez.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a45562db15b---30932751066.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b863b42b---44365107520.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/pokesizuvaxuweferefo.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109031648364947.pdfIn PDF document text
    • https://ikansambel.com/contents//files/25813446063.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/mugegijube.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/dokegojanajetitixiga.pdfIn PDF document text
    • https://peterdegendt.be/file/23404215193.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/40e8488017bee958fdbc4eaa35d43f27/disalewi.pdfIn PDF document text

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