Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce594c757f8d475…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 01:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 0a04f56611a202a4da87d1ecc74b764d SHA-1: 682a16a554fcbfffd6101fb06d753af6582f393b SHA-256: 0ce594c757f8d47592c259efe166718c569b2184eb193f765550c6d06dc0743a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=probability+sampling+in+quantitative+research+pdf PDF link annotation
    • https://dallaslandscapedesign.com/media/files/vibekogemudigiz.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a84de87ba38---jekewodufuva.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/denanomo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc29a4efc76---mixebagi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d412096f841b3b4300625900c9888c3d/rabakirub.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ccf4347d---86878754498.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108160159083912.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e091e00cb0---budubopunewevumudatoze.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/64784068478.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d78ff3c1cc9d1a32d42315bcb60d1b9c/gimisig.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/66369431339.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/tosekuleposot.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16113df2b7a638---39959657390.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/44945095687.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/a1d94a7f7e3ca0700fec360e0eb7f0f6/85136039337.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vuzesukamejosewexo.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/sigovusunerikotetagafem.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/71841812445.pdfIn PDF document text
    • https://service-panev.com/userfiles/lubari.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7dpa80ttbpv18go4j1qkkcg04v/remavozazejedaturepe.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/74023801675.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/39498620615.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/21636100371.pdfIn PDF document text
    • https://blugarden.eu/file/87245722645.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe0a7e4b30---4142071893.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d2bd1ee71---kuzidudaguwumipowidox.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_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 16412 bytes
SHA-256: 09f3fc4dfe7f5064362fb7791329779fb96c70e48f6f57c5c2243b55075f2b15
font_02_sfnt_off000126b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B8 11636 bytes
SHA-256: bb2723e889b42a313c79777487652f9f12eae5f62cff63fb7aa47e40e6bb53be

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