Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bde2e78c90c1bf…

MALICIOUS

PDF

87.7 KB Created: 2021-08-17 13:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7eead950ce25947315b712f883f5f05 SHA-1: 32a169d0e1d3ce1eefa6967b60bff53616164621 SHA-256: c8bde2e78c90c1bf7c6f3bff8111abb660efb110a98d89f83d61b88c4c9db21f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and a high number of links per host. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs, such as http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b37d6d5e---lixagizoda.pdf, are likely intended to redirect users to malicious sites for further exploitation.

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://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5429d077ce---safalabekenel.pdf In PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/55a5dd63fdb8f88292ea0dd9f317d2d0/mimovegexezuxanunel.pdfIn PDF document text
    • https://irantruck.ir/data/file/1217782152.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/jipimamuvoruxipumaki.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b82376f95a9623043ec15f251fad224d/50310051944.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/xaxajozali.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b37d6d5e---lixagizoda.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/39257042006.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/velujazajogowatetudew.pdfIn PDF document text
    • http://zimmerei-possert.at/jitaxewemedipapa.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b401296977d---nularetemapupodorar.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/c64c8c292583c464cd882161678fea4e/34496694749.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610f553ace5c4---71439764415.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb50865c2---vinipirebenoziburod.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/topeluzab.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb7818e662---5238788753.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/dodaritubi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f33eface4227783ed1b4c88f89682c22/pajoverasiwumulubodukibe.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/63829793296.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbe91ed13---biwigovefamov.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/4a367f5638d82497359bf416f3c4dc17/dizopanamufubox.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/cim7qf94m7fqet0cspopl0ebt6/7325062976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=1001+chess+exercises+for+beginners+chessablePDF 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_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 16832 bytes
SHA-256: 7edfd6522dd5c495a411ccd21595d549119c10fa93f7827ee96c5035e98223b0
font_01_sfnt_off00011fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 10836 bytes
SHA-256: 17a7f896f0430d4ae4bb6fcf3100195826ff233cb6eed8d09a0cb97ec0cb742e
font_02_sfnt_off000138cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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