Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95e1f71e0451c6d…

MALICIOUS

PDF

62.8 KB Created: 2021-09-11 03:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf9b4a978d0b4827a3c936b57b70c2ba SHA-1: d726ea1b8d94a57135763bc4d1d3d440e5da1319 SHA-256: b95e1f71e0451c6d54b33d80db9a52f0a19154779db56e0755a84e99d754a5e8
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, including compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7330

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 http://szermgrt.hu/uploads/ckfinder/userfiles/files/befitixixinuropidaj.pdf In PDF document text
    • https://alixdemassy.fr/userfiles/file/88468538962.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/gojitiluxef.pdfIn PDF document text
    • http://www.depomatrial.com/file/30766572943.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/81931105392.pdfIn PDF document text
    • http://popmetre.com/news/files/pewuva.pdfIn PDF document text
    • http://orthodoxnews.us/file/gibafo.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/66191883161.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/vedimenuxes.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/pebevage.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/gipavewasijubonegukizojaz.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/6170094336.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dfia6u3mipsebvv79osnupjdj7/jobakuvakevenodaxos.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/36925520857.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324341c7e8e---71864678567.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/kasazofabisovev.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/xiwugafopukapuwo.pdfIn PDF document text
    • http://terminsk.by/pics/files/rewidosuxivesolipewu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/70292555600.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/mujorerevufalulemawoji.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/laxepinavejudunabusapimu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7005dfa70ee8066dcd1a914e52ccd4ec/zubepobajulolij.pdfIn PDF document text
    • http://laduses.nl/image/file/fijupup.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/xatubex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+deleted+appsPDF link annotation
    • 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_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 10368 bytes
SHA-256: b69abef8edd6c790ac8cd6e1323382cfe190e0345e09ed9ce62eacf6607da2c2

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