Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7c84ac4b81ccaf…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 00:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 025e2709cea36f4620b5d9a43118d3f6 SHA-1: 3e71608256d91b821c49958f57fc655b41dc5fd0 SHA-256: 9c7c84ac4b81ccafa9a2d88ad154dcd0e55ab9d5d9688671234ee3b819fc41cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://pbchistoryonline.org/uploads/file/67409119186.pdf In PDF document text
    • https://activepymes.com/pub/file/fibev.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/takuw.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a046c5ca403---gizonumuwi.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/58879861766.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/veseduwamafenude.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749eac696c4---82734675603.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/mekuriboxufuwidesij.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/25228789340.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/80922197943.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/rumimokigilamepijuza.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/93qej5effmd234j660t25jgm04/xozosonapefupevosilu.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/29648904356.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/12f3fb55c1574315fabb69353a86fcba/46916113345.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e1fa60bb---11073970209.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3b879872d---87509755236.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855f61a3ba5---48160251490.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/joluvojawukelow.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ced803a6574265e973f630454c198bae/44624808808.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4a249b7a6877d6bdde6676e0e29d8846/36757864438.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/jubirejo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/55164010909.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/17850719737.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/62883476827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pain+from+belly+button+down+to+groin+malePDF 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_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 16880 bytes
SHA-256: 1ee415b4896af80a70c3b1098626f32b091e3e50a2efba3b5ddb2c26315335ad
font_01_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 10968 bytes
SHA-256: a75c852960c064ef6a62380bd0a694a6bc2d16cf8071686abe8a8b2562091548
font_02_sfnt_off00013372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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