Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32081431d9cfbb0…

MALICIOUS

PDF

75.1 KB Created: 2021-09-05 02:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 631706989cbcc720180b531c0847b3d8 SHA-1: fec20b5196caffbef2195b5c35a3f1ea6c9044f0 SHA-256: f32081431d9cfbb03a5f2ffc667d8aa02f3b314ea5847dfd04c316a1a3929ac5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a phishing site or download a second-stage payload. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://taketty.xyz/js/ckfinder/userfiles/files/dakidaranukezotobidojije.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/67280724395.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/88291895431.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/guzopinemulo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8eb81b33142f540bdcc5f33198571e08/famut.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/8691419205.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/47f6bd90c3e64265e710fafcd86550d4/jariwozogug.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/52002543311.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/dejoxanotoka.pdfIn PDF document text
    • http://mcutech.net/files/11705553995.pdfIn PDF document text
    • http://licausi.it/userfiles/files/josukolurinizosexivaram.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/filavimavakufuzolodiz.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/33854175315.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3dd0b4d6336ca2b53920fb385e459aa1/59883036597.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/42368472571.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efff3dec80---81604887024.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bb5ecf295b6cdda7a8d33baf00f10c56/56700443813.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f69eb608b---49078016586.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/biwowuputebiked.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2478837bf54112057c82143409cd13e5/jifapogexerakidixamudi.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/86929749140.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4ab4c5815---rowip.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/2658088154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=milbank+20kw+generator+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_off0000c02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02F 16872 bytes
SHA-256: 43859f80436d842f7f8c902f31809e6f510df0f4fa627f8fb22c60e578712950
font_01_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 10936 bytes
SHA-256: d406e59cb6cf81401c274c6c5b263b1e3b3a87a5104c0d713a9b55eee94a37e5

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