Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9e60e7f75e2989…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 00:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 224d8dc902b4a4bd9fdadd1a1818de03 SHA-1: e0cc17396ebaabf403dea91b3f8cae992f8a223c SHA-256: bf9e60e7f75e2989fc405ab4c8c44cb7d7aaa2302dfbd4b8a7e07d9390c317cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous URLs, many pointing to WordPress uploads or similar structures, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://hotelbasantresidency.com/uploads/tafilefufurogabo.pdf In PDF document text
    • http://canoeing.by/pics/files/19526550690.pdfIn PDF document text
    • https://citronel.com/userfiles/files/sivesofemubujalonutebos.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/serijilekeridapozaf.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/girit.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062314593654.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/20e1ddbcecf80852da4da6a122a17ddf/20549137055.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bbc048869---welejin.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/eb949d734594655f22f566bc6746a7b3/vitoropaboka.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/44j4tt5pngauq23hev3s13mjh1/48521058262.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/tomutepirovawejuwaras.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/47749049158.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e7enagrl4fl23e0q3g7dec2f2u/rumolakubutokimizetabafuk.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2jim8vhv1ctq7ju69jccjprpt6/58745005318.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/kulegiwuzovat.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/131802499112.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/digotak.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///94236522973.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb12f2008b1---89804900048.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/zuzuzuvemozavesa.pdfIn PDF document text
    • https://lemanssrl.it/file/wirek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=use+scaffolding+in+a+sentence+educationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 17168 bytes
SHA-256: 70ec39e193e3124dc2ba76bfa4f66ba464b62ddfe81fb7d440198082aec2bb3d
font_02_sfnt_off00012baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 10660 bytes
SHA-256: 3d2d51b7539b7d2b679c329d3fef3b0fcfe4fb0d23b5212ed3ee928476f6d4ea

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