Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bd8fa9fcb4d822…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 16:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 73a81d41c252697c4808e600a1e62150 SHA-1: 6efca129277cbd9828c4b209c1836b74bd1153b7 SHA-256: d0bd8fa9fcb4d82297cc28a6e6cb0528450921a3175c338ae507e2a64a8c8063
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs point towards a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/achmseshckbfi55c87dii6udb4/5300493792.pdf In PDF document text
    • http://vesimport.ru/userfiles/file/57325812446.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/kokokalutanivosawilukiku.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609247e8d4b93---gagudefabazipumafip.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/895912712.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/nabavuxizukurukalafozara.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8c91123c---nijitoku.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/denifemugovutage.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/pumij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e43171c38---bemumipigareril.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b2b7041c---34818463016.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/78a063284001211ac2c13c50cce8c575/27586845505.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/tevojuxawa.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/utf804dn5m2kmbp5b1hd5d018a/koboluzajurafixofajotil.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/lobas.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/fulonidotetosape.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/81403212920.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161233efc22df4---33769721423.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa279e7ed---karimurur.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kigopuxa.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084360179c28---pinumiromilegudilutomi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4dea7d91---61117516229.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd8ddbcad---megudadoxufa.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gaponegarobe.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/d4211e9d8d8aee84871dd73d50b28e55/1192332132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=degrees+of+comparison+exercises+onlinePDF 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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 16696 bytes
SHA-256: 530d08e4cb1092ef62d163898595d85a04626505c52d24a8a9f4be9b8b3c5427
font_01_sfnt_off00010686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 10828 bytes
SHA-256: a06385ed37ed32bd0e70a167bbac0df7f8a0c1ff25c2208d863d41accf132cf4
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1