Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cd4c24bbf7a024…

MALICIOUS

PDF

85.0 KB Created: 2021-07-27 02:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 764ef31979f11a3e02f3452db23eca1a SHA-1: 6bfa075cbd3de9515032402fc36fdcf7e913e1f0 SHA-256: 41cd4c24bbf7a02497774a8dfcc7e47c2222bf5ccf912f5e9f8e3342c4fbac41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://dm288.com/slicice/file/51855846366.pdf In PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/pusegatodozujumofiba.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/4629986523.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7742a8fe66a9b77d699a25897799ff9a/wekajenokuf.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/poworiposakefitetuf.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/77603003651.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/40244ef6c49a87c79b7be74a193103a7/vijegalemikilatibaw.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/lokosoxuva.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb64e936380---pivivetulo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/30c50e582d2bb8ce5916d93b5b5e20c5/dodiva.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5998c7b06b971a1fc311f53f835cf20/baxixawibogawilozanukelis.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/zorokamifizipofofizer.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d5bd4163d169fc20d4712a6165511e9f/bogagaxefemi.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210628_3386907465D8223A.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/radujotiv.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/9444158764.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c1a3ca9c4e---jiduwuvobexisovunimijofo.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/739861f3d07a1ac7077aebeae486dffb/lowabulifidevovoxijuk.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/8526381360.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ehrvob5jkm83cfdomklm6f9b70/22828888343.pdfIn PDF document text
    • https://wecareprogram.org/images/file/62644531823.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08c754506c6aafe03315a6f862755db9/89527599618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+many+carbs+are+in+a+mcdonald%27s+sugar+free+vanilla+iced+coffeePDF 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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 19224 bytes
SHA-256: 4381c03fa84c780746d83733f980412eba1ed8f47de82042bb2a00f26640961e
font_01_sfnt_off00011320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11320 11252 bytes
SHA-256: 390622bf7ad83e3640be4595929a8407afeaf7dd338e9a2cca217bff689a5f05
font_02_sfnt_off00012d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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