Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0bd75d9acf68776…

MALICIOUS

PDF

79.8 KB Created: 2021-08-27 20:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: fbbbd8ee08d7e1a775cbee75551a1a21 SHA-1: 79f270eef5f48c55978c9703b99617e0572afa32 SHA-256: f0bd75d9acf6877668159b924c1421263139d900b33c0bbe64c8f6ccddecd3d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous links pointing to other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate a phishing or malware distribution campaign by directing users to further malicious content. The presence of a link farm on disposable hosting further supports this. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da38dcd261---17616899363.pdf In PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/mafunewadep.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/liziwe.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/kajmoqevp6li1ifsaa0pe87g3f/ginulep.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/dosunujenowok.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9f06da4562ab1f484856b8c6d3557e7a/68816161483.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/mavudasotowonuzanuk.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/73276105230.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/zajolajekuxenatixepat.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/54qqp8l8m7h67195cacunuf7k6/10988507041.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/37898797122.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/51356393810.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/81897965598.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///giwevirivez.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c40c8fc4---89034801175.pdfIn PDF document text
    • https://akvaguru.hu/user/file/26738525668.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/175329944460e526ce4a7cb.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf56c8fb88---xupopaputolugi.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/geboxilolamuxerubaj.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/gotebidofidabawazutus.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/23968371469.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9585692ce3---64283962557.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/gobenagobox.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee9204261---29099488225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hydroplaning+safety+tipsPDF 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_off0000d487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD487 17148 bytes
SHA-256: ecf3494b38497f0b50bc906082f9cfb20f6eebba430f70b6719d9906f0e0d28c
font_01_sfnt_off000100d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E7 10776 bytes
SHA-256: b932f0b3e0659e7a636f787d8c2ea50adfb88061677ea4e82857b0ac0c927239

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