Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f2a03c4d80340f…

MALICIOUS

PDF

75.7 KB Created: 2021-08-29 06:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b50fd60b6e1984afa808c60add78a343 SHA-1: 0c21726ca4942c2b0bb49f232aaf33fcd656ed2f SHA-256: 87f2a03c4d80340f44d2ed9150692a417d4e030f810eb70ee3b158dc08c1deed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely serving as a lure or a distribution point for further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://krisoc.ru/uplcv?utm_term=fun+and+games+at+malory+towers+read+online PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607742f429abd---xuridifuwomeno.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/14516203492.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c85d6b56f0---lekobolojozewugogavumitim.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/27484125868.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///nexadizubolokerelevokenof.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/lumitemoluki.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/vuvuwadijaz.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/77645359384.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/titizijezalu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/36lndci76j68fdor88ak2rvef6/84727384386.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ff53cf4e0---1640923980.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/27hnunvccm27oumh0hnq2u8f54/pebepepegomiduxu.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/malenalibunowo.pdfIn PDF document text
    • http://gibisch.biz/files/files/fafuselikiguzazozabujewur.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/xeradotozor.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/5495b7399390e82f635b0ad13a3495b4/xaduwikewegedes.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/tekebitu.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/80725472762.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/laripavaritaluwuduwemi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/77cdbc9f88e70a345b722f362d9b38d9/duwuwukewuxowawi.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/bimivi.pdfIn PDF document text
    • http://oodow.cn/upload/file/210707220707695439w37fpvacw8a9.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070710643b51---ladisinufusuro.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/bogakileb.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6332a4601d---gipak.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5d543515---zitokelaxisizusexinuw.pdfIn 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://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_off0000c4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F0 10868 bytes
SHA-256: dbafddc33cc466d4c0f6a09cced4440a4d3f1d7d37222b65559393ef104cebd1
font_01_sfnt_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 16856 bytes
SHA-256: 0c519dd5acdb8d8eab585a4df71a9a4cc1302f6272bae005282b6b83ade9cbdf

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