Malicious PDF — malware analysis report

Static analysis result for SHA-256 454620f747889437…

MALICIOUS

PDF

95.0 KB Created: 2021-06-23 08:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 73083fb4563f997c776a065a602f7bf7 SHA-1: 6423f4ce4729726edf17b5bf20a65d8ef5cbe7a1 SHA-256: 454620f74788943737f270d704ccc032524c0319bb4e8c5d1e065a862295b3ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a document, possibly to disguise malicious links or exploit embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc9808ee54---disiza.pdf In PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/31918056877.pdfIn PDF document text
    • https://hgb.se/filer/file/74704463291.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bb5da3be5ef8c02340d3e586c39cd1e8/sajotumokebobuduramok.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/53501862085.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/sakasidiwivipufuxulit.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/37914262380.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/vodusenakinu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/idpu73j8iklsif3fo9oalfpg8r/zonikasivixewemoruboxade.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/37645586100.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1oa3rlgbpkmbtmv5m4t5okv5gs/zefopoxatib.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8a8ee5d755c1fa9f82c22eddc6bbfcbb/79985058010.pdfIn PDF document text
    • http://www.heksan.com.pl/file/vizewopi.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/2812273126.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=legend+of+the+sleepy+hollow+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 4872 bytes
SHA-256: 914ef573a292fa87af3e999808fd7d61b34d675dddae26f8bf407c2f1152c727
font_01_sfnt_off00013988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13988 12492 bytes
SHA-256: 3552d9b70b083c57096a459b6fb4c7e405fc84889a9805d131794bb13fee8693
font_02_sfnt_off0001613a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1613A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.