Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b8ab66e52e8d37…

MALICIOUS

PDF

111.2 KB Created: 2021-07-08 06:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e5bb0f0b67ac3cc79c30b9dd52721020 SHA-1: 02fe8b797e30ed155b709693b1751c6a25bc82f5 SHA-256: a2b8ab66e52e8d3726d000dcbda0f68acc086c28790f39f0884b30d077724d04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8b5bcd2e5f2a9b2e81c41d371a301f9b/gamototenegejem.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/j9m9t6vh973dfn2jauouiq8bh1/11448299913.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984c5d2926e---zadoremabe.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77935314083.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31796a1092---40536343996.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc41603bd---56836321811.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/59187921382.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f13702474bb6e19489a6ba64cdf2924d/98100618508.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160940a33c72b5---75814680389.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf046ac55---dakemujupumo.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/37c5ae236a199528ccbc52af4a58b56b/vadarigajibelex.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/26250399747.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/sunorutemev.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/5451507443.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e641d3e4ade22956e64cda9cb4d3743b/12369777991.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/pu3jtnamojml6kcmljfq9vo9fc/telopurobituwagubesorinas.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9c3557843c6bf8a8eb79de4e793c4dd1/58929952594.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/tixorulujof.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f7a8e8719---buvufiwemewubufilu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160743af2d6e11---nutiwuniwija.pdfIn PDF document text
    • http://tianfonmm.com/d/files/fibibizo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/hm8oo3ho560k0a05i30qi1kf82/7288884428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=preparation+of+hepes+bufferPDF 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_off00015317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15317 10652 bytes
SHA-256: 57d744e6f341e70e5ba17897e4bf9dcabfa83a50998f22a01b2c7d077eadf573
font_01_sfnt_off00016b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B30 17420 bytes
SHA-256: 7d5901e44e0d0d5f001013ca1a4ea2c2636cc7d0fa53bb5394b4044757d0d6f9
font_02_sfnt_off000197d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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