Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cb2b1ea3594cf5…

MALICIOUS

PDF

77.8 KB Created: 2021-08-04 10:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0e2d990c7ae585b42ec2d3c5a0d5e975 SHA-1: 5b7cc23e172eacbe093043f3e86d9f86bec93804 SHA-256: 98cb2b1ea3594cf5605a3334b4ca708463f66f9582e8e715a82078018d333e01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. Although no scripts were explicitly extracted, the nature of the links and the overall detection strongly indicate a malicious intent to redirect users to harmful sites.

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://crysiq.ru/uplcv?utm_term=libro+un+viaje+de+vacaciones+escrito+por+roger+pare PDF link annotation
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/idbhpnum8i9vhf5172act00bk3/58700499061.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/latepig.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a57837cf---17591190431.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/88916637007.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/goloranitikalovibugokomed.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0860477c76---5241725406.pdfIn PDF document text
    • https://efnnma.org/files/file/85926838732.pdfIn PDF document text
    • http://katachizu.com/img/news/files/wumofuditi.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/15793359192.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/43743620256.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/7bfe1fa47966b4640eb387421379501e/fipuwodepitepuwonolesili.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/vuzovalata.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jefiriwofosajimojalofo.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/2111807746.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/notuxubonufadosuxatajo.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/tuwawivuxerufizupufen.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/sitdk27k52a8amkfmenntdmljq/watitopuseko.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ji7itk2fmjuu0b9ffot79fs4na/dujuxaxexuzogas.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/73c2c52c04eddb064ba36b63d3d0b5be/91291512568.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/66361998229.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/86390841112.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e2f4fa1bd5664a46692cb81b2dde028b/modajekolekab.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7064d519e---limofokeravowi.pdfIn PDF document text
    • http://htwy.com/upload/file/96073729525.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_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 11036 bytes
SHA-256: ef2a9728ba3fdb365005b25d6c5343ed4fbe82613ba69a38b6caea83fb1925ab
font_02_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 17356 bytes
SHA-256: 5c48c9b688ba432a2d159cdf2fcb7ef314ac3f6f5e7162c52564e0c6bfde2744

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