Malicious PDF — malware analysis report

Static analysis result for SHA-256 4003fa74cab024ac…

MALICIOUS

PDF

63.7 KB Created: 2021-09-05 07:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d4cbf434285656d726548c11f63bfc3 SHA-1: 6d45fb472f89290c6477dc02af20a1d2c1aa8c57 SHA-256: 4003fa74cab024ac65303f876b4c9b02ec22c01ac04317c0ec4b5fef9e7a413e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading to malicious content or further exploitation. The embedded JavaScript is likely used to facilitate redirection or obfuscate the link farm's true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5107

Heuristics 5

  • 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
  • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

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