Malicious PDF — malware analysis report

Static analysis result for SHA-256 4827c6a0b06d0e72…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 07:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7ad83823d00d98e700c555b85d2eaae SHA-1: 764fbf0d2524e829cea7ffc1ed2b1e59e107eb51 SHA-256: 4827c6a0b06d0e723df4397693d8d937642c29cef56ab22a4f0d94881bcf9506
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple external URIs and the 'link farm' heuristic strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://zold-kommando.hu/files/87063490087.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70624f1c1e---gibodabu.pdf
    • http://www.contectrade.hu/fckfiles/file/zofiwiziluwever.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/monaxuzevadaza.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/juwonufowevulazawukaxaju.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/lddbvi20tjcgfvqko2st4uj2gq/12108680907.pdf
    • http://aexpress.lv/index/images/up/file/67868875424.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b50f3256---vewevixulegamokone.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/trba98o1a887j0p68djhv1a0cs/47828653010.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb764718e19---86523657662.pdf
    • http://sbox-technology.com/upload/datoteke/mofezireles.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a957970f66---pagilavugolulefew.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9c77f019ce2c81626ed0c837702c5a5a/51984909483.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/q6odi4qa0dujp5ldh7ti1k7661/jewavunizireleb.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa80184417---kegoki.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160700eb6dc5fa---92289494811.pdf
    • http://msamerica.net/clients/873634/File/13980021181.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/44bb022d1d8e04f5b1a5f47d9fb09987/lerivasaliweb.pdf
    • http://scheiden-maassluis.nl/uploads//file/sosonotegirukajinizex.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acd50b322---45268893099.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb71405e7f4---levigilodapokotaso.pdf
    • http://ipceurope.eu/assets/file/92341662607.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772b3253fd6---84827022385.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160966bac496bf---zuserijugebupozone.pdf
    • http://st-ark.it/userfiles/files/wemil.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/gl0cjvajabksvnkecpfs9d4fu6/16608495321.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=peter+sarstedt+where+do+you+go+to
    • 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://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_off0000e604.bin
6a35e54fc1bf05f0014f79a0ddfc2d685a59f719e2acf3d08ae897a0ab14b3e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 20160 bytes
font_01_sfnt_off000117aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117AA 16792 bytes
font_02_sfnt_off00012fc1.bin
961f269b926d53a4a7421ac08a969b4e57b8fa1e7453b45877e66ba1aad54f26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 10584 bytes

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