Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3956912e9d140d6…

MALICIOUS

PDF

77.5 KB Created: 2021-06-10 04:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b645ebe2cc74f4bc8ea00b5ea3197b7b SHA-1: d82d2551ffeb8bc83224b41192c148f7829ffa9d SHA-256: e3956912e9d140d65f795e392f8a24b841f6834016f3ba72646b03862dbc6731
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be related to 'inequalities with variables on both sides worksheet', a common lure for educational-themed phishing. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=inequalities+with+variables+on+both+sides+worksheet PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986ba6c05dc---46560794056.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/v2p5q248rl9117r098ggj65e2t/pefetevawazabesi.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/97dca297e82438cfbd0cf3d98a83b172/54066088590.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081917916569---jadaremirorapagigepapof.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abeb38457a4---23363634109.pdfIn PDF document text
    • https://aedwea.com/upload/foto/54251269704.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/95611733047.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160913e6026b46---jujanas.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ff7c807fb---64412552449.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/naxafib.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/23n995mo09nd9gdtv3ajvh1eq2/38919521084.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8812de583d895ef942d4478385eb42cc/51969891577.pdfIn PDF document text
    • http://cocoal.com/uploads/file/tukafibesebeliwijus.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dpe7hgt7qu2imohdtlu51bkee2/daritem.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b53fcaa407dff6c18e3e08933eb9240a/jikotopuvogajogamusaxeg.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tapemobixuke.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed8d2d8a7---38065296895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 5216 bytes
SHA-256: cfe3199cfc1e3d7478817737fdeb85d7dcfb22c24d7be7f44f01116f902ed0cd
font_01_sfnt_off0000f5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A6 10904 bytes
SHA-256: 1d0edaec777b1d9c796c64e23e9c008b66c9ec5e11cfa5d56fc6f4fec9e0f534
font_02_sfnt_off00011a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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