Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54eedb520036da9…

MALICIOUS

PDF

100.8 KB Created: 2021-07-20 05:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 077f11c800729a951828a39f36a2187b SHA-1: 54c522f02288d84842112f3a9e2f822ca4e8b72e SHA-256: e54eedb520036da91f227b7e6587f3c2bf63c0101efbb838ddbca12eed53686f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous links suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd8b44508---41598401392.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a4ddd6ceb---88173132353.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/30582009546.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/178203112f747d073c906f9be9ee21e7/mosunavipuzazuzu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773d524306c---69316247205.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e900d4b62---55385985853.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/12165685741.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16095d166ea654---52525341538.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/1e572afa9ee7916f1a072ab5dbad8acc/72556910507.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/zugidutatemulaw.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gipqnjs9iihlnq9mlrn1087tf2/wupilopufowexel.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/b3141e7822c84f369d1f517dbd8be308/gajab.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/pmg8k1o0cp62gmaih2an3oi7oe/gigedo.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/zirebef.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd27b171765---boviteniwakakogifaxiwud.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c862573983a---xureduwagorukobotakiv.pdfIn PDF document text
    • http://mp-journal.com/media/file/rakumametubukase.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021060301295980554.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/30b0f61223e8c8c414505badc4c9e2bb/34692345125.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lu525pqotirqvugbita708tsmk/8264179055.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb52e30da---xokek.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608030fe45533---dafosoribisonalepivimov.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/25731668010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=discoloration+on+hairlinePDF 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_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 19884 bytes
SHA-256: b85e900f6490739588d279fa14100362a293e8a0fb702e5e9fc9683edff334a1
font_01_sfnt_off00015690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA7 10328 bytes
SHA-256: fe406119f02dd71bd7ef70ba98147e01c931aa7c7e6861845b4f1f2e2f9c5f5c

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