Malicious PDF — malware analysis report

Static analysis result for SHA-256 e254b8b9e56ce932…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 11:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18f8bb95bdb6ca1057ebf95b6c1046dd SHA-1: 742a936aa49bd9a8c8cbc9b2445b6fc90127111e SHA-256: e254b8b9e56ce932a4a2c6b042437eb565302a33770f904d225d33eabe985756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to artificially inflate search engine rankings or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=how+to+upgrade+android+4+to+10 PDF link annotation
    • http://khachsanmyngoc.com/upload/files/komapivapopivaver.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd640548b---33259265455.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/93712919235.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/80577451065.pdfIn PDF document text
    • http://space-edge.com/upload/files/36249866970.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/fazixosagoranovejupim.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/gisinuku.pdfIn PDF document text
    • http://philipsphotographystudio.com/54956505355.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/24471229531.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210916171134.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/68437924216.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e1e24d7e7---lijakuligiseku.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/99438217658.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/56824709649.pdfIn PDF document text
    • http://partnercable.com/files/wofupel.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334e36aed59---nofizajedinik.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645fe1b199---xazorimidejewiturekogi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/52141570657.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/68903865660.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb4eab2a95---12106927455.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/h3ugm2mb2ra8h0qsiv573tk78p/59604742643.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/mitifedetagilise.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143749f80860---nonelil.pdfIn PDF document text
    • https://goodline.by/userfiles/file/purezevetojupitajurawoko.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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 17308 bytes
SHA-256: 43622adc33632b7fe1c50f5a705b595389204bf5f5500c66430ea7ccb7f795af
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 10784 bytes
SHA-256: 2c490a92d4614291595177af252accd2a12cb8ee25efac172aebd05979d45958

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