Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a7dc662e0aa83c…

MALICIOUS

PDF

76.7 KB Created: 2021-09-13 05:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10f43e2407a5c5502a8cec16dab5ddb1 SHA-1: 00ca729db268347da522e0c2c7aad44d8442b704 SHA-256: f2a7dc662e0aa83cf14e960644d8f862c11e380751ba71a9463416ddd00e73be
96 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to manipulate search results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5eb4845e063fa77b87bcdbbd56093d56/bibawizonunusivel.pdf In PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/29898965257.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/af66ee5268757bedc95f40146134a27b/28012473101.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/66860906838.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gutifazakad.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/balowuzokitevo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q512qahg4hho7nesktkljmud9g/88877232228.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/bebasejale.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/47851436921.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/bafivoxel.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/21349073405.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9fec8f16d7ddcc7ce456d6b0e85a8619/94682027631.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tvtrhb2qekpbgauuhi2c3o7opr/fujeno.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319b00a9d95---funurilop.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/notajanakoxavitev.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134379a292c5---81868155668.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210912114517.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/27832913567.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/80012969026.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f36053efd5---19852291594.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/geraruxemiviwef.pdfIn PDF document text
    • http://cascad-trans.ru/files/5946370229.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/35580872299.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/7871419587.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/15577992023.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/4l5hugi5e0g73gafh2kt794rtu/zezosomafe.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/rokebawutufidupazafon.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/latosexamawemisokijofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=smart+watch+low+price+in+bangladeshPDF 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_off0000c745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC745 11264 bytes
SHA-256: 57e931fe952166ebd85910d4271bd6f959f6a049d812fc75b660b7401a535024
font_01_sfnt_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 16908 bytes
SHA-256: 1a8b27e2f49020ba3cf3d8867d3fc6ce7dc3fe805887dc24f4af16351d5ef9b6