Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da040261c4708db…

MALICIOUS

PDF

86.3 KB Created: 2021-08-09 19:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7a99303adfa5402c78bb71c2d4a5f9c9 SHA-1: 76e703255f1e58d7454558b570dc16c6bc8b8b80 SHA-256: 4da040261c4708db28715af078f82ef7b915aa093be0e6a5ccea953a70fb5b8a
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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://naplesredeals.com/userfiles/files/ranikifevete.pdf In PDF document text
    • http://jtylek.pl/Upload/file/5363085012.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/qnkqqept4s9720cfmeondejurc/zolaxazobuwuxutimadutonid.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/44e6f2badebf2de49e2bd79cdf7675ae/xujotodaxutelugan.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/40543442424.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ae238fa196181db20908abfb2773c821/16648995128.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210617202712_606bnr.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/dcba6eb0e00c712432a80124876a35f0/36312988434.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809cc8e48de---81185479640.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/18821383331.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/21889898211.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/be017t6uc8vs6shpjbnb4js6c3/96444458888.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/i06c1m9eajk7osn8k3ummbpbn2/dadatazaku.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/jisaj.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/jadesaw.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f14cc6f6f6bd18b5ee1b8fbaf0320599/ravaninunebuxe.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/mudamatidanuse.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a70e6d3e8ac---dikidododidifojugugev.pdfIn PDF document text
    • http://asustainable.com/global/file/74008513561.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e89dd9b2c---34526637317.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5chapipou5if1n0dcukgog9m20/mojofoforip.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a351275f72e---togurisesepip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=class+10+maths+chapter+13+all+formula+in+hindi+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_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 18228 bytes
SHA-256: 81e86fb8bdacfb11cfb1fd313e7a574bc2506b902a9d74a0f9fb322052d61f72
font_01_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 11364 bytes
SHA-256: 7ac58763d48a9334b40a872e750b874c06d8e584ce838a14c25eb2770825f511
font_02_sfnt_off000132ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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