Malicious PDF — malware analysis report

Static analysis result for SHA-256 df201d9f5c23b0da…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 11:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07546f03e173c5c0e74ab6d7fd325fa3 SHA-1: d6d1f3756ae6149ec824706f2c8102a163713304 SHA-256: df201d9f5c23b0da8d2edcd71a5d29e30bafdc5a8d3e9efc12eb75a1f36b8ea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the link farm nature of the document.

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://synerhu.ru/uplcv?utm_term=pronomes+em+espanhol+pdf PDF link annotation
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/08ddc81a42c6fadf8e36120c791e2189/nuvakitalosuxexel.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/lutizodinenivixaselo.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/jokokerulufovixepobipu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d508541d87afd5fcb03825cb3f6572fa/binomemixiwolevufo.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/zebozoxe.pdfIn PDF document text
    • http://baoveantam.info/upload/files/18925000972.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc0614e8ce7faf8abff28692bf60ac9a/5287893351.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/vizogefixexafivoroji.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/pulipatutujuxugatuguju.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160963c67dbd37---95703335104.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607638c2d1412---18237683917.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/57386879512.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hgr1a721mt5k62ph319m3vo0ag/21784368905.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4fac570004---finabasukolad.pdfIn PDF document text
    • http://renovator.cz/files/file/21211562327.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a3e47db3---4205615283.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/60798546491.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c4a5cfd53---46019831522.pdfIn PDF document text
    • https://saam.vn/images/content/file/jeziku.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/japeribiwivefun.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/tewas.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5d22ba2742d9c04dde3d732bea8cc957/41637507116.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_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 10572 bytes
SHA-256: a7d758242cde4b6854ecf9496122e38c7e014753c0ffc55bfec5a86d109891ab
font_01_sfnt_off0000f6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 21620 bytes
SHA-256: 6eb32c919b6f9720b648763ba631d167725a1aff37dfe3c189d8fec3fe649d3e

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