Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e75b07864ad968…

MALICIOUS

PDF

62.3 KB Created: 2021-09-06 04:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c24e5c456237f9beb796035bf98a42f2 SHA-1: c436ce9dc7d4728935a52d887a952e9f490ec65e SHA-256: d1e75b07864ad96830c77cff52b18b52299ffa5b670cb288d66bad466ad845c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9227

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://ketchas.ru/uplcv?utm_term=revista+natura+ciclo+6+2018+pdf PDF link annotation
    • http://ekolojikweb.net/upld/userfiles/file/57219354583.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ef5992dd93c93a9c345173e241cb80d7/gaselarupi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab94212c18f---63760578948.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/54904636022.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/68294944553.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/fuwawikubetufosuvotiberuk.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/76451697775.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/revoxerezadoluj.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099b828a877c---razemuketaxefelatisexuw.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160800cf843902---31533765887.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/72953286572.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cb2ea857eb56c80b744d248ac8f7aeab/rejevewaranakodujasapub.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fabae6e84e0---84768946603.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7204e9b41bc31c6c6258556659a0faa1/58934217079.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077544f261fa---vonevokamefozemubofusi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16070efa2d9403---12874707349.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/30459200874.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/69091030869.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/42877618225.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905e8f650ee---fufulezizokilugekupe.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/neginabokoroxano.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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 11492 bytes
SHA-256: 212abfe29dc088ada86cc916959c30aa863af2eec14648a0ec33a55e887da922

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