Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8687761fda112e4…

MALICIOUS

PDF

101.8 KB Created: 2021-07-03 14:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a268fc9f6a743b68936884dfe50b7bb SHA-1: 98c6589ad78204a29a492ecf8d192c62cf0b1782 SHA-256: c8687761fda112e402c4e79efb19f9e2061a86f390f7668f4bdd97942660f7a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's primary purpose is to trick the user into installing a fake browser extension or update. Multiple heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. No scripts were extracted, but the overall pattern suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089b308c151e---32057298305.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vb00k4bmlfkk01p5fv8kv7r5hq/pebibovix.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5759a8091d1961a724ce7eb10f0d495b/4445016187.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/de4a51c623decc4092e3d86f358fdb29/xelanojimutakuveke.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/98781971950.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075d5142b286---16355071926.pdfIn PDF document text
    • https://studiorampinelli.com/file/32710144073.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/peniweguriruwatisawiso.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b841eaeaba1---98644523500.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buzimeririjud.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/72568718361.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/fivojilizixas.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37294241d7---46487094929.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/80223895129.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb45d7d55c---zuvivobix.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd80c18c0b---zigufonerilenumiva.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9abc22e42d5a7f6847d05d416b7dff4b/pogapanudamanisasudo.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/50170aee75874f2c61069962b1cf0b8d/30158854026.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/96427742496.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/15368210254.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/16441645959.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1b5a23235---nusaso.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3a3qgpgt71jkp0iprb8dgcc2o6/gonigupukixebabepopadap.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/tqgqmst88drkum2qe76srrj31c/19608906969.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/1n10g86uvtvh7gafon0j69c0g4/tidapifulelejogixuwimep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=printer+not+showing+on+chromebookPDF 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_off00012bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 17416 bytes
SHA-256: 38cc12e56cbd515ea58059c8e8f1b0baaea632eae4595bb8898e21cd09189ce1
font_01_sfnt_off0001592e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17145 10788 bytes
SHA-256: 9c4e34a7fc1f07344a9594d9643bbc69f56d7c6ceaea6aee6ea55b35fcd63714

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