Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb2d3b4ff8d8995…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 04:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c1b0cb53052d5af5753b72711d0f6ca SHA-1: 88a6781c922cf608e2982c537b752e871374610b SHA-256: dcb2d3b4ff8d8995f2cfc3152871ccd1b53f0d0ee6f6acca40e2ffda8da0eca5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains an embedded JavaScript stream, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to various URLs, some hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to deliver a payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 http://www.primariasantana.ro/uploads/file/zutekopewemowunukubarobi.pdf In PDF document text
    • https://loctra.net/userfiles/file/33424286561.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/xitajebonirilerowozugumiw.pdfIn PDF document text
    • http://dhf-china.com/d/files/pusovonixi.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/fifolowujinitulodamap.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/380b58cbd356ea61bdc2927f57c72a84/59767857577.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/07842dde7333a043ac525c0fc7404931/tibozasekunadirozetorosen.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/kesipulatenofizadirivijuz.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/murubajajudinodomudasi.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2gh2jhmgjn1aqr48b9f2gtpveb/suraxipobekuzopanuro.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/65642090446.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/91218024463.pdfIn PDF document text
    • http://twilaw.com/files/files/mowuxevusigikoto.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e901d2e979a---rukib.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/viwalenuxisutanuk.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d1fd33777aa8b6d976742682c734f376/5830664557.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/vututikokidav.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/jebutilokemidesobuvefaru.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/joxivumosozivem.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kegexafazudawegubu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765c39373ad---93784624910.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed88013eac---25269976453.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/woxevatasajefavulazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=computer+programming+tutorials+pdf+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afccaf66284---kebagesol.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_off0000c102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC102 16816 bytes
SHA-256: 7fb1a7108bfcfb72f6261cf2e45af68cb75b63886325948d0b0bd313fb0afa5c
font_01_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 11056 bytes
SHA-256: e4fb92e6b38e3a8b64afd5b49d2b4c17e0dfce414cb5362d07eb7926948336ab

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