Malicious PDF — malware analysis report

Static analysis result for SHA-256 c372578dcce1da5d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 03:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e1f69ed8dbbd01a62ff77d8b7e25b9bd SHA-1: c717f1f5b9923841e81f59f997a8bcc2709a5935 SHA-256: c372578dcce1da5d8da01d6d7606fd7320ff52b130ad808cb24b9d0186f60dbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal the document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/dufofaxufifokojexesad.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3d08d7da5---57476607307.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210714_060976DF04E33B91.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/562e64a55e9f062992250d9503417112/doxetonosivojafaxix.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4lsc6v4tp9bu1lht6bvn15t5d/96799199695.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210803_4DCA5834F5DD7326.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/kelab.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/niweza.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608621060a42b---32546679816.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/zuwejupub.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/sofuketufenawoxamumu.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/30912537546.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/13hk5j6m5a6tlac5ki33breeh5/77122754413.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a651a6c7d08---pejuzafuju.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/puwoxexusopaxopev.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/memurawo.pdfIn PDF document text
    • http://htwy.com/upload/file/25078683486.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f173a4c72---rasib.pdfIn PDF document text
    • http://belloverde.net/emailer/file/mokajitexe.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/lojuki.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/dilerivunojufifanarono.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/96716586958.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8flv76t6sklugclr8demtlml17/73634564923.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7defcd9728117b2b62f75fc2bb308aed/85521235618.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/ac8ce8e59b57679845bd61e85ff6bfd7/51351593934.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/vagavu.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/bajug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=farm+animals+math+worksheets+for+preschoolersPDF 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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 18364 bytes
SHA-256: 8359c857358c172c97cb9af1d93853be22b08e7cac3a6b351f9c7d31cb42d90f
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 10900 bytes
SHA-256: 4e460f2a431e2bb7343d65e7e50a267be2a719ad4226c22cdb5c55c56e76b84f

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