Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62e61403dbfc3fd…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 08:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cff026aa950ae793ce2d7cf8f0049c9a SHA-1: 9925ee6e8379810821622b1743587ae573447a70 SHA-256: e62e61403dbfc3fd0cda357e0dc73d9aac59ed6b16649ab80f4592009fb5aaeb
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=ca+ipcc+syllabus+for+may+2019+pdf PDF link annotation
    • https://fwullong.com/upfiles/editor/files/80646902672.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16126989f88a71---36967805642.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/92406710553.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/duvowinobi.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tedolumusapofexapesuni.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd96f17828---91199733043.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa902f8726e---82886947880.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/jolipawoxexazepumabifotuv.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/47660104873.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/06eca386c810b448fe6ec4276c75d40c/89803484553.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/15904993413.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090d779cf919---70847627037.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608495b14f7d9---petabifawebis.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/24383261647.pdfIn PDF document text
    • http://mcutech.net/upload/2021/08/file/1629051821253265927.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fiwofopedadilo.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/d21dba2f3c3988b97154437135de0a45/28218675156.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/49097452ccd57b333241730af36172b8/sutinoguxe.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/p64cngch91dol7usp6mk5mv330/70967759612.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/74592218360.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/1810532061.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a26e465d902c49f8f1a6b2a6ffd3048c/tekafej.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n4nlim0guaiq6sc5egunlfbem4/rufukopipamebexeno.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/wiluzi.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/tadidogazusapuzikojaxuv.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/salebutit.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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 17552 bytes
SHA-256: 5e6cf0570fdab6826e6d26f231b94e791c6e1d60bf5f8de291e508582661c6e1
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 11292 bytes
SHA-256: 52f899905d9b196a20d512cdf7a1b2e979ec838b0bb75afc2601854d84a4d63d
font_02_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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