Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df4b0eb714d27c3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 07:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c9824c45b02d1e1ba4b7d575335d48a SHA-1: 16e891d3346ddec7727b23ca648dd2a67e38cd9e SHA-256: 5df4b0eb714d27c38ae5818cf11e82de7bff43fc4bfd816ae190594c372f951b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://cructi.ru/uplcv?utm_term=frequency+table+for+grouped+data+worksheet PDF link annotation
    • http://1yunnan.com/ckfinder/userfiles/files/92858651151.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/parapugesobujaguge.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/1518778129.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/73060977305.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/liwileriwibetomalexetone.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/6556233678.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/muragajipupemox.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3384ab162d---jazajumavijakosisefobatu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea05c91561---judubetiferaxatim.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a887579deb4---fexuzitonejexikaw.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/2idn295dvftr7fb1o3211rj4fn/21648077591.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/21244922384.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/jomadunejukid.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94f891583---guwolesikimapesaresexax.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/3c7d8982716c041047151008de2e3ead/28407126896.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/bajojomonadadu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bad92bf2836---vorobosux.pdfIn PDF document text
    • http://esistore.be/userfiles/file/81483220822.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/zerirevos.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/257f65b075593d90647d1c12fa656dce/61401649379.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160872b48bb8f5---rivipekigawufotemurug.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/97808835718.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb35e0d8082---86280743853.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/37541491662.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/92737770026.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a9c71c2e3---tirimamuxafugaluxiluk.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_off0000b57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57B 11460 bytes
SHA-256: 56e8817bb7c55f3a391d971a81805b5b739d6c72d4feab2d2cf06a311e87db0b
font_01_sfnt_off0000cfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 14588 bytes
SHA-256: ec0ab019862f12386961f8d0d91d10e7f20dc652484322e39abae31ee69afada

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