Malicious PDF — malware analysis report

Static analysis result for SHA-256 181907c2012bc7bf…

MALICIOUS

PDF

182.9 KB Created: 2021-06-13 16:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8f419ef17bf12a7feddbd6740ea53920 SHA-1: 71e99c6dfc162f829e9a333c99c8bce7ccd41ba9 SHA-256: 181907c2012bc7bf2e6f4a6b7ccddb3cc20ae1454a3ffd6c5eeea573ced5b23d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9582

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://infrive.ru/uplcv?utm_term=more+than+words+fingerstyle PDF link annotation
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095d39258559---91531395494.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ta7d38hv10hi26kbrf1d80omq4/56159646117.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0ae5e4dca---15218001666.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file/%5C/26280233297.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bde3560f---73058048167.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/44016862799.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608040da64ae5---93085749490.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3fd6778f---duleputabigupex.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/0jlcoi14hecna23kbafuma55bn/temapipifipogurerux.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b13a1f576de---danufesuwum.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1748d77e---10910677814.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7282bedde---gumak.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eaad1e227---67707697908.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/35693535794.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085da3bd0853---tezajupasexagaxirekososus.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/51536716441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00029d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D03 5368 bytes
SHA-256: 97acd66c24b95e52c7fe4160a9601a00504965c6572d09c8636e2b0a819c1c12
font_01_sfnt_off0002af58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF58 6612 bytes
SHA-256: 6f2f4076721c297639fded385fb2ce1a7f625b3823c0edcc964ab9b67325fe5a

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