Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7c0afc5b553152…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 11:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fb9771a4de4e42a1b957213c2d12e65 SHA-1: 7b13730baf016c1db36b5d0984447ff1b78bf0b4 SHA-256: ef7c0afc5b553152a5fade8654b89de9a90bee4020c7f53515e5292c2350fc03
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kvkumariajnkvv.org/singhania/downloads/file/46375465750.pdf In PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/bdb954e249e505b6845bdad179c9a677/33641729189.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d286a0daad---13628546272.pdfIn PDF document text
    • http://promador.pl/userfiles/file/94115057126.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a39e2390889---7851852910.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c904024e60---kuforusepineroruk.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98e26c7fbba3a09a39cb98b1c60200df/sowimanes.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/96564895623.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/eddv9uo55se1fdmumls45126g1/92545261769.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/22292673031.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/dabcf9840c695ee78f39cff3c4947720/19139041797.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095f82512fbc---53678675218.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/pumixuki.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/95446408759.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/jofedanomigerinevategin.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/serorarukulitafimajigufax.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vsftqrsrn66t1tv3bnkj8pd1v4/wesuzulosegeravugowagaxe.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160de680014f13---61034699095.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/xemojutigarip.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/79689460773.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wizadesuwuvogajata.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e916006f2f---56663416286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=chevrolet+owner%27s+manualPDF 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_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 10596 bytes
SHA-256: af33e73e0c1aa6bbfbb5f47998b2b02b14b4113756690d5b881012b2bf7c0c23
font_02_sfnt_off00010f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 17720 bytes
SHA-256: 056935252b7e41177ffd59b732d91ddd203a3f1e0548196b8d333c6f29d40736

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