Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8b0f9e70166224…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 16:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cec30076e305485f44e56fff50b170a SHA-1: 12ee7450d36d61311ef0c33cb3c31d1169694013 SHA-256: 2b8b0f9e70166224209c24df908e554a8713dfff63d2a01b1c8a719935db5c88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely to redirect users to phishing pages or facilitate SEO spam. The presence of multiple external URIs and link farm heuristics strongly suggests a deceptive purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://coretry.ru/uplcv?utm_term=iphone+11+pro+max+camera+features PDF link annotation
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/69c976ae808badc272bb974b0429297f/48089651317.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/dmb4avkmpdqq92dv994beqtjhd/40774178882.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1af8daa8775b01670cbfbf6cc6f39b12/14154416652.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3d12a2b1440496c8d5c809a9797d3ada/75030311599.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mmfu5dljd322ms7l9aei5prv0i/686722989.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/oqlttdeg3nlfa002q87n6en1ph/lijuwobizinunesaka.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d55b743712444f0aa654bc0ee026a79d/23882541899.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/86acd9ec834751eeaf38079acf1a454c/34976164716.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4bc9cc1885bfc6c1f8c65e4d8ff398d2/74903168990.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/79394589187.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/dolosop.pdfIn PDF document text
    • https://promise-land.com/upload/file/palapubupofijeledelo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc6e74353---18060860795.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7fbf9ad2501aa3eff6cb8bf034bb34ec/wusaj.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e592b49e1e---tidafuwotavajewaxovoj.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/nonenipenakebebazupilil.pdfIn PDF document text
    • http://russia-ex.com/85765107770.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9a37d661dd675fa334a4653f8420e347/47855719802.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9dc1b1fd---vatudugip.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2467831378.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2cd3ab4fe---dologurupadazebutav.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/65326074346.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/18447629957.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_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 10812 bytes
SHA-256: 4404249f56b8e55c436de222286b95f7151d7e6d604b020f2380bba2d8f80faf
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 17204 bytes
SHA-256: e6b23fd1a23525f42eba57ce90342ab4cd86ba860c6a28a0e0dc93e9bafdc2c4

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