Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf78b224a5bb85e…

MALICIOUS

PDF

86.8 KB Created: 2021-08-14 22:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc42043192b2b9b786c6e7966dfef284 SHA-1: ff3ca28194cdfc8e903dcaf30864848aa8117685 SHA-256: fbf78b224a5bb85e66815f997b35e89874c6d76c5cb724588faca3f911da3363
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF viewers or redirecting users. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://autoscuolepintozzi.it/userfiles/files/836179712.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3822b3ced---73561144347.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/dejezupajoxewuboxapiwero.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac6eedc5e---28598346075.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/4444970664.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160808c6177fda---zinobeke.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dc8eea83e---25935004140.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/21df00e3ec162c0820c3907f373acd9c/guvukosodelibopubaz.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/26bab4481d208125e5d6c2ac28f0f0e4/87860256427.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/77232845040.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/monesi.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210606224131_2roji3.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/mofipemosozediretujubidur.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fddf1cd91f7---92032982855.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/jilalutepa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160792b8d5911b---patupatuziwatew.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/74437193906.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210810233100.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/44196bdf5d6d17c5678078bd445596d1/65635489432.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7046ff61654a4f936930b22b7d65f065/fudofozoparebovap.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/41d9c127ed1801ecade5d93fc1193029/tefum.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/venivarogekewozanupegar.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e3d397364ef588cd4646db9df88ef16e/lelikoligapux.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1a5d2f75fb2ee0ec0b0b07336d014a7d/23162938901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=plus+que+parfait+exercices+corrig%C3%A9s+pdfPDF 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_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 11196 bytes
SHA-256: 7a510a7f13d7440f3fc199bfca27825cd711abfc42c40232c72279c10c66e232
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 19520 bytes
SHA-256: ef8ad792f439c6823054be6cb4d410da16513df46f72ed6aefc40869da20ae22
font_02_sfnt_off000131bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1