Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b874b55c7eca8ab…

MALICIOUS

PDF

74.1 KB Created: 2021-09-04 01:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69991e00624906ad010525ccea712a40 SHA-1: 6e836d641e90a4ec2ea5d970519be4c8f51f3011 SHA-256: 4b874b55c7eca8ab5a3cdc02c4674eb82a20720fe884c20cec01fbac125f850f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content or phishing pages. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=pisa+2018+indonesia+pdf PDF link annotation
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cef429ff5---najuwav.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/9276129544.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/1g5idvd4uql8thsb4cslf0b22e/jewuzile.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/87420480535.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612add453b1bd---40076853775.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/fidapuvosakezukurukuzarok.pdfIn PDF document text
    • http://dchs80.com/clients/c/cb/cbc185099defa3274d3d4f74835fd64f/File/sosawaboniz.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/34435613340.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/5dbcofnnlholdlblco4f8103bc/39413661767.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/35409004671.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/47711674150.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/xasekawutimaxoxunoki.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa95a8ccbb---73994694082.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/41216513072.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8770d523a---66760820722.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/64774522041.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e213f7e2a2e---kemadekixanuvizupino.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/506b84247ace258a9db69344b4bbeebb/74701961089.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9ee36b8ffe78e352cca029cdbd56fb59/fawemejug.pdfIn PDF document text
    • https://maisonforville.be/documents/file/kudamawidujojobu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/2no6ca005ulg2ppa21p3rro5s5/80189600615.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c404a889a7---77720719906.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/54c620a4cfdbb995b236d4e0b1c9359f/laradupowu.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_off0000c09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09F 10752 bytes
SHA-256: b968b21c8bb39e060db83ac7f37a411686f60ed2ef51426973cdf2982a070e5d
font_01_sfnt_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 16144 bytes
SHA-256: aff3b3a1b0439ae063b6e681db5867397167ca7d44f02c632ff0f38d999d94b8
font_02_sfnt_off000102f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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