Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c4e52f69e66f3f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 16:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f52a4c7000422dde1719e9ea9d44c7e9 SHA-1: 6c7b9c39254b2e0ab50e9c389bd2c2f17a64c58f SHA-256: 54c4e52f69e66f3f5fb1df9e48e66362f032e7c3df986c37e6d078da6dac55e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=toyota+tacoma+2016+manual+4x4 PDF link annotation
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/gixapukek.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2777e8c72d---zigirupebunolasebiradipi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28097578ec---letofagipagizuwafubosumil.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084fd2c72d60---89330995007.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/gimugukenifelox.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/8057234558.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b19b0d0b9---96907612434.pdfIn PDF document text
    • https://moolans.com/uploads/files/noweladi.pdfIn PDF document text
    • https://isosklo.cz./uploads/91676599596.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/xukunewujuxidamuriperu.pdfIn PDF document text
    • http://signauction.net/userfiles/file/43707961290.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/8199474255.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/5040c1486e1d243e3a6322e63d72d602/posinevalafarebej.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/peruvad.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/momusu.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/wirekukutonodolejesetet.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/14208401265.pdfIn PDF document text
    • https://avela.md/userfiles/file/49753249154.pdfIn PDF document text
    • http://93564497.com/userfiles/batakigefavorozutozaf.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_023722_144.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/54679714343.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/xamunijudolaboxiz.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/gelokepo.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/54434131798.pdfIn 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://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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 17088 bytes
SHA-256: a976b2751335a1668124f9f490a08531306e987b40c06055f5857701d184d918
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7F 10720 bytes
SHA-256: 2cc9d6b5663136a8c862b797a36513db7094a85eb2587461531dede92e03b312

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