Malicious PDF — malware analysis report

Static analysis result for SHA-256 727e4072d810021b…

MALICIOUS

PDF

98.3 KB Created: 2021-06-13 02:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f28bfa4e63ccdfcf1f4fcff75e30b3d2 SHA-1: 18faf108674f72c3cb0145f6d8a37780dfb04371 SHA-256: 727e4072d810021ba2008e4dbfc6877c8fb499ca6ecfc16ff97224044e3bb74f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is flagged as malicious by ClamAV and an ML classifier. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The critical finding is the 'Clipboard command execution lure' heuristic, indicating the document instructs users to copy and paste commands into a shell, a common technique for executing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://pixomot.ru/uplcv?utm_term=how+to+combine+multiple+pictures+into+one+pdf+on+a+mac PDF link annotation
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5ad4e6f399ed9038727ac2fc1568f377/50123916395.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a2412bfb---fexomapusivafaxopivo.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/rgjhfk58t31affepj177bk5r36/73332645096.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071541414e04---dizuzumazulisunaneje.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/kabuzaniromunexuximas.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/h4dcrmvnbq8fv5550oke0ou5i1/54553367402.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/vowev.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1bc50f202---zonojixanefuw.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e0da15296---95450352468.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5d8e322c2d5600534236ef7ee460bbae/futowixotavevatojazivez.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297eec9989---25462801994.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/63917193408.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa7900bdd4---42521230961.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/35cd7bce6798454a22f103115b9d29ad/95297305180.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/39n7pgslqpnrfkde1itma31imv/57358130860.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba03dc8e31---70843978753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00012b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 5492 bytes
SHA-256: a739de82c3182fab0ed7fb07b63e8fcff614979a5f972023963d58bf26525f87
font_01_sfnt_off00013def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEF 11912 bytes
SHA-256: e6eeb5815062c86a7c7a88dcc21f3073969fb9df532c01566c832983a107baf5
font_02_sfnt_off00016602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16602 16388 bytes
SHA-256: 534e44c921e8acb9c8e993207df297c85ca6c672af4c6174c05b3ca24a170572

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