Malicious PDF — malware analysis report

Static analysis result for SHA-256 2426d2bd9fe8b104…

MALICIOUS

PDF

85.8 KB Created: 2021-08-14 23:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8864d53f8367ba7b95e0a36bf173b39a SHA-1: 79bb8c562a8943e46e20a45722ed9c537c0b442c SHA-256: 2426d2bd9fe8b1042e4ab2a8fd98e4b1f28017d75b0b7a1dabf53fb6fd4db22f
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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://jun-travel.com/userfiles/file/69181722373.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/443bb98c21f762222d39f00937a736ba/58795649671.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/rinurazowutar.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/imkiiefi2apmc322eu2tjujp7i/87757414110.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88a304658a---55101682270.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/79107622627.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c002020e35---regewizozevorolaka.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/96058116909.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d902b4026f4---14906842325.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/55059729934.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/76719169619.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/wijolamugitizetemi.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/36274267697.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/zebapi.pdfIn PDF document text
    • https://egf.tw/test2/images/file/67129086958.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210811_E67CFEACFE3075EB.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/lewegojetilulisufe.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/35898710958.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d3db6f643---pugebefesulovisojik.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/gifisatogakol.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073807f84f21---beroxumux.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611053777731f---gexiguxilixinedigitu.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ae68648e---nonixug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+companies+reporting+earnings+this+weekPDF 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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 17288 bytes
SHA-256: 75b34dc2d7af36b5e05ceb1495206a3b1e88283d7f0507b561dacb9094f8145c
font_01_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 10948 bytes
SHA-256: c6060d7e6a54e55d6e5921fbbef6f7696ef373faf04bb47aabd1e18ea3f889f9
font_02_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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