Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b88a05bb2a0464b…

MALICIOUS

PDF

94.9 KB Created: 2021-08-03 19:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9dfda251472cdba18c6bd3ab12f96ce1 SHA-1: 171242c245d5ea755d95bf9f0ffedf381ac96ba1 SHA-256: 3b88a05bb2a0464be24aa91aa6a197ec96f4f8a6e098708b268ae9e05149546b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://huntic.ru/uplcv?utm_term=how+to+get+auto+clicker+on+mac+2020 PDF link annotation
    • http://fonnepal.org/userfiles/file/kugijerarufozi.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/41753419411.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/34440779594.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/43343548245.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bce047aa053edb92a7ba299664074faf/77586863792.pdfIn PDF document text
    • https://icbacademy.com/upload/files/9191779372.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/36066398933.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/72697559570.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/3cle09ulk8mf2jhl3n0349u867/68938458147.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/24334171683.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/folazafemufanibafow.pdfIn PDF document text
    • http://thebaileyfamilyreunion.com/clients/6/6f/6f45d7e5c9279c15d0bd3a3fa6949618/File/xotonezaxelako.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb55dd6d5---85204021370.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086a84375d83---vijezatedepuzufuwapaguf.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/dogaridomexowega.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085647c9f614---99004476168.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/15667784727.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/dewagalolozasalaroporizi.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ac00d2e84dcbea8e9f36a99bce5272e9/92349806471.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/07d1ea559c480b20c33313ef7c074d44/79916716885.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/9nm38m5ji7pfs0nri2cmer56i7/leben.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/80354302281.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90e02a44e7---sepoluliguz.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/13626070500.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/64904331951.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_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 17316 bytes
SHA-256: 15aaa503812410bef9c6ee319e351277e99f428e5772d37e77010744a0fe467d
font_01_sfnt_off00013c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C00 10916 bytes
SHA-256: cba0ccbf9f790af24253c34845c598bbcedd1a14983806a25b02ee70bfc1bb24
font_02_sfnt_off00015556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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