Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9f85093a17e94a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 23:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6837e64f62307b7a80710b40322fe75 SHA-1: 19d3af6c54c90805b4d7a64eb58c8895df3a0446 SHA-256: 3d9f85093a17e94ad581372f08f3e13d1f777adeb2158c397ad9b4d070d4f841
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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
  • 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://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/wosetefen.pdf In PDF document text
    • http://zimmerei-possert.at/tavisi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9dbcdf5e040f18b033fb7a1b8d3a04fc/fuwonidukenefofovevida.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xumoxat.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/faxugijowosomazokusolod.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/dekaf.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdce6a4cf---55198701091.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dee14154d7---33318004536.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34dc5fda1---46792083405.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/68711521895.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cb8c0c4c8e4b3eee22f7f0953282f2f9/xixesulowilitaxorasirole.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/34494948282.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/88575642133.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210730000906_sfu6yo.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/luseforipa.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/2692136890.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/99048924031.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/lemomoxaxivadodiwedufa.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8b515bd6---goreguxemopupolexodazapu.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/vubelebodo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf68dbcede1---kuguxo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/lebaluwadom.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/afma5ao17n0tquhnqj1jaa2hk0/tebena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=disserta%C3%A7%C3%A3o+usp+pdfPDF 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_off0000df78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10908 bytes
SHA-256: 52b62b47d9eee076117a47a2a2a2c673a9abfe03e93bef941f1983b2e9bee6c1
font_02_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 19184 bytes
SHA-256: 9aa4999ee202b72a3f1cd49691daabb7ba647941c310290d969e07d7a37c89f7

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