Malicious PDF — malware analysis report

Static analysis result for SHA-256 793bf965a267dfda…

MALICIOUS

PDF

80.5 KB Created: 2021-06-07 15:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a45cf7fba662a58cc5d9d5fb963bc2b4 SHA-1: bb3a4fee4acd02af291ed927c1a9d4a7b0e13fb1 SHA-256: 793bf965a267dfda68413700447af0549fe762cc89617f56c560ef8c0e37ffb3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate maliciousness. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of a 'utm_term' parameter in one URL further supports a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://krisoc.ru/uplcv?utm_term=mini+militia+unlimited+bomb+old+version
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e02e94d9---wubewojeji.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/n15jopiflfbabmgbglm8i9g51f/41057885771.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16198907057949.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160785f64e218d---metuxuwafizelatetuvuwagej.pdf
    • http://metaglas.kr/userData/board/file/vigomipuj.pdf
    • https://damsindia.org/admin/uploads/file/nizufipizitaj.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8839e78f6---feforafaruguk.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f79d6d00---99108150439.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ead7f34567c5e1c1540384f203dcecd6/vuzituwozunemogitoxetibi.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6e85udskf8ie65ig8dbfdgoe51/pefewuvomaliriralexadosi.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608208ee5a12b---webevopatalutatosimimil.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608971767939b---jutisinifiwoj.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c336b66467228a57732680f6f39285ac/buwobovabo.pdf
    • http://anandtouristcorporation.com/uploads/newewev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a6.bin
5fffe509ebc2b6319e2a823cf1be0441c877f20e94af74e59745c0fcc73a0441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 5176 bytes
font_01_sfnt_off0000fa34.bin
e4875cbd61b7abd559c9b544c42f9e3e123190c897af3e42e2cb45daf4943467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 10872 bytes
font_02_sfnt_off00011f86.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 16204 bytes

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