Malicious PDF — malware analysis report

Static analysis result for SHA-256 546f8555061a261e…

MALICIOUS

PDF

79.9 KB Created: 2021-10-05 12:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee99665375ed341c405e9291f32e59e0 SHA-1: 731c58a0967652dd609640fe53c582124626b365 SHA-256: 546f8555061a261eecd3a2fb97b52d20657a0b99c88e3abbd8eb1de4152bbdd9
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4803

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lica.plovdivweek.com/js/ckfinder/userfiles/files/zamubif.pdf In PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/gipanave.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483bbb3bc95---15827095103.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/rogenifitopubekenuzi.pdfIn PDF document text
    • http://juentai.com/userfiles/files/84955427839.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/58158164757.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/xogexozonanu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615b70c8815d3---6434192974.pdfIn PDF document text
    • https://davnosti.ru/upload/14574565972.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a92c0ce90---5631375417.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907132952.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210917_D836675A297AA6D7.pdfIn PDF document text
    • http://quranday.org/userfiles/file/suvozogopitivasinogeta.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/6551702385.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/piluwak.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1470c1046---xufixivininifemeruwinakax.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8615874cfe4ac182f8559d885969f3dd/83941923941.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/farikejujumawaku.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/88648530235.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/27355897022.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/tusugamobi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615b9731797d3---68603628848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=nba+2k20+mod+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 18376 bytes
SHA-256: 529c67c5bc53a94d09860dfee1d15ec2fdc2679c156db296c135cfb1004d76b8
font_01_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 10416 bytes
SHA-256: ab5e98a4d705c098a1ff7fa8a5e900fc52f3bc030d2a4d21448313e18b1dadfd

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