Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec26c3aab458a35…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 00:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1d48b7a4b268d2b9251cede3344cd49 SHA-1: 986f917c36a75538c99ad624b4935742a19872f2 SHA-256: 6ec26c3aab458a35de15333e9fef0e29662f82abac96f8ac6bdcfe63f109d8d7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and PDF heuristics indicate malicious intent, specifically flagging the document as a link farm pointing to compromised CMS uploads and disposable hosting. While no scripts were extracted, the presence of numerous unknown URLs suggests the document is designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/8b5729938c10f6c3dadd6b40ae813465/jaxitonifazanuletu.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e54b4f8a390c01926bc8ad52a9232ca8/lotajujogej.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/tawapuwaviden.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/72927093765.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/74376681259.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/51243603348.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/9428829166.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/bijisemex.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/62501151479.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/1468112967.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/kotixiratutoven.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/kakizigilegituzubuva.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1c58c2f6---10226049074.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/308e5605f00d68edd647d6fbbf03a784/jikedusujev.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/554a6430d04149222c00bcd269085544/pebizutisizezonimemaxetu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e40073466---31107519296.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/37860524476.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/44411100260.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/27990170608.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc08488d39c---44370616857.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/lubigitasow.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/83661708277.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0c0235b6b874ea3682d7326d9749a4d8/xajiron.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=paulo+freire+pdf+downloadPDF 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_off0000be2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2A 18180 bytes
SHA-256: 4a6209446967a29fa6cb3ac5fda3b60f4536238a048c641cfbef8179e131e861
font_01_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 10412 bytes
SHA-256: 9493a0813bcd9e2c2329d53a87f0d0bd2dcbab98650756e788b2e7f3a3c08b9e