Malicious PDF — malware analysis report

Static analysis result for SHA-256 1481199858413923…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 18:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1c56b2536f98ac1ff9faec3eba9b7af SHA-1: 11f619b83c2d813b641b5950294c4bb69c5bc576 SHA-256: 1481199858413923e615407516e114bc9de251e22c36ba65298ebae117370240
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The primary attack pattern involves directing users to potentially malicious or phishing content hosted on these external sites.

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://www.armstrongre.com/files/files/3574477752.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/2419e1fa67db312402f781fb6a184207/zozewusexujozuvu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335a803697---94056017819.pdfIn PDF document text
    • https://alutat.com/data/file/95196036133.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/14442114759.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9090f0d29---bojokedibajupimizozitu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/spmb0uju3ralajpk5qfcurqlvo/96180056213.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a378baf1ac2---36400213026.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e82bcde643f---98268744326.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/20338361865.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf37d253faee40f99dcb7e3b7f8b2ce0/72967606589.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/885fe154296f5babaa3d7e825bf0acb1/11278001851.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba051e57f---zomizugetitoliwitonad.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/wofimupelawizupudolawu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc129bbf01---57083635260.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe5e8e11e---73328146924.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/87347386706.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/33baa071c459dcfba3f85075d4d99c7e/nikovumofesomorize.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/19355115525.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/63976076728.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/72416589819.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/77159047983.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210905141027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=schema+de+cablage+sonorisation+pdfPDF 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_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 11284 bytes
SHA-256: 447b67969593a682e5638c3bc10b48af714335aa07bf01b994f932533dc3002b
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 19972 bytes
SHA-256: 75f273f987c9ec242d98521171f45fe27fbc1dafc1e2b4a1ff6bb30e9ee6247d

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