Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f42e5233f78ffd…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 23:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faf6669ed4fca4f59291b6748ecd185e SHA-1: 7416d1313bc85ec8ffffef9a14218a98b481455a SHA-256: c1f42e5233f78ffd74bf9e244b7c761c974e2b7eaab82159db6a8ccba0ec35f8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress installations and disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being served through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://infrive.ru/uplcv?utm_term=computer+graphics+and+visualization+lab+manual
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b454aebc---76673172454.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609002acd3078---65213679420.pdf
    • http://archi1919.com/smlclub-files/file/89944521915.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2ec735e8c7065a57c597248a96f85a10/losifaser.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160703146e4f2b---27716155579.pdf
    • http://splogservice.ru/content/file/lonedapifizunexasopop.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/dad3b523a128c3cd5d55ea333b923a47/kasofubisasisimerav.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8cf01839e06ac3813e9e7515e3ded9e7/97141059742.pdf
    • http://alkanboya.com/files/file///logevu.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/jipug.pdf
    • http://pnmanagementsolutions.in/uploads/8769042579.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12a470933---1234789328.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/fbg7aaunblv271bj5vctat3kj2/xurarironelilurewu.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1195e3ede7ab31fe6dd6374838468c6a/62895627776.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/5d17b6e35a2ea623ec74c1377cd40483/kilukax.pdf
    • http://lpkgoodframeupvc.com/userfiles/files/nivegikizowoda.pdf
    • http://inse.us/uploads/images//files/zirobeze.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddea9797d6---71352617190.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/491cd06d79c3c24526191b28d449450f/41102135926.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a5ef2b774---59123601248.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6f7b05d68---xumotixix.pdf
    • http://baloneacessorios.com/_upload/file///76124924196.pdf
    • http://asupuro.com/user_data/image//file/97775958379.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d59bbebbba---vuditubada.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8945300baa4cac8a24af58192ba2e252/17570243026.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7da58d5l3r9u89ih1cqft5d0j7/46541237163.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8ef2d1f08519766c647b436822832e99/sirememugowekugaxetop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103d0.bin
937b797d058801db5cbe8a72ba0f13ad5899d616100c9baf8aa937da44e6ca51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 18076 bytes
font_01_sfnt_off0001334c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1334C 16792 bytes
font_02_sfnt_off00014b63.bin
cf17ccaf5e20eb21dc3a9d5caa20406a0b56e42768b697e3cd1018027d034010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B63 11360 bytes

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