Malicious PDF — malware analysis report

Static analysis result for SHA-256 498a9a8555f16fcd…

MALICIOUS

PDF

93.1 KB Created: 2021-06-29 15:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3963f769d47eaf624f613eaddcba2b3f SHA-1: 495cb31e3d4e63f6848b6c0c4ce5a24c06eb27eb SHA-256: 498a9a8555f16fcd1df094ea2282429741bd5f802e45be11b882741a8b6d5449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://coretry.ru/uplcv?utm_term=law+and+order+season+19+cast PDF link annotation
    • http://baigeleather.com/userfiles/file/59090357491.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/54025100382.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d6ca71faeea7dc0f4a30c3d7621037ed/binawivuxegakuxunufasaz.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/qb7ok8rnloug5v93dik1rab706/pezutekubizefotewus.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a3a0fb758b0ac6a0ce3d2b6dacb72de3/87791475900.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/58424043497.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/42795310294.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c48cc71ebc1---sovajuzevekulenozix.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a666a94c3---87659207761.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/vixoberof.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/49c2b3ebbbfe66b6d5ec5b32090fe3c8/guxajilenafinelizaji.pdfIn PDF document text
    • https://noddy.nu/images/file/31231117412.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52450239608.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/87667965840.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0b435534a75522dc4589d671207989cc/37255433943.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce63548fcc8---82085250848.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084de0a7b2e6---boguzititoru.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/57532512a5a178799d6fc17e6b96be1b/vewatosaxuwuzepasegef.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/046d85ee0ea88e41c2b7472251288627/fepisupu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/0c8dc0b1bb1c5e5c8f6997dc52cb1edd/48284745920.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/m1pqd6ketm7luiho0f5thd8c70/50455940066.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ih2p6gfo1de6a8vgl5iibkpsd3/bujatapubulugeberemuvawi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/28731240088.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/65572827774.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160791f1893e70---lazababoraxazakemik.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/xusukekikegitowekoxifoki.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_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 17908 bytes
SHA-256: 742ffb5981f9464d118f5c61dc4b0b74f7333d0d35be782c40124febab696849
font_01_sfnt_off000136f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F07 10488 bytes
SHA-256: 4563bc5d7ade9fe627afe74e8147d562358feefe61743186d331d7d5a0989ad4

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