Malicious PDF — malware analysis report

Static analysis result for SHA-256 440cdeabd45e83f0…

MALICIOUS

PDF

91.5 KB Created: 2021-07-21 21:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e405e21e389baff0e457182b8cbaacfe SHA-1: b0b972ffa48865e8866828061e2c6c13a5a4a5a1 SHA-256: 440cdeabd45e83f02115561621ce8ba674f4ffebbbe327046774f8cb1a37fa98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, and the document body was unreadable, but the overall structure indicates a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c434cea06---zadarago.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf3d51457---46596284537.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/08718763b97b42088f0f1d28cedf2173/84164384210.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/72090445359.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/09b1a731796a822628005ef7bd2711c7/90264548788.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7f3a8e78---80576981405.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160822368e6721---56633358123.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/vunedepot.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/kaxajofofeze.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/janopepufedusirowiloj.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e5f05c6a9c2e3c618608a7dde22a07c6/51864136655.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/0dfib4035g7nqrb1h0nvno00lc/47098124674.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfc7b1102---fobikobijabixivefowarosew.pdfIn PDF document text
    • http://email-database.info/userfiles/file/xelipika.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a22394f20d9---96273834054.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089a5259ec54---kedurepegipexojenab.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b0bccc366787b566a4a8e53a5dd0be6d/7157723473.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vinag.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210625090214_zhxrpx.pdfIn PDF document text
    • http://kezmosas.hu/files/file/3698370519.pdfIn PDF document text
    • https://airshow-bg.com/file/53812211942.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/68d35c003dd49b8eaedfa496d883dd04/gosunavivutegezirazitijo.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cda28c826af.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/55227326060da11a26d4a948bc8e3e72/bapodula.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210721_151419_168.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/fkf1vfckbfjb601cqffo8emi7a/wuwibewojez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=muscular+system+labeling+sheetPDF 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_off00010297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10297 10904 bytes
SHA-256: 3a4b5356660cadbd2a26bc90ef73cb09d157cd62c039c8d27f69397c8d014ba7
font_01_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 16896 bytes
SHA-256: 2741576852647851b099e88692af0b1617cc3d38dcb90502139f104cac6aa545
font_02_sfnt_off000147f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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