Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff3d5a5b348b07f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 20:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e93d43c34e16a0419c363a4ac147332c SHA-1: e213484a398943ba99faa7b406e73f0e859a2102 SHA-256: cff3d5a5b348b07fca1df4b095e207e216907f556ed9d3b166c9487d703e5191
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs indicates an attempt to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://auto-rujo.com/images-editor/file/40377337912.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160df824ba690f---95792654819.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/jovidajibigogolelexabu.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/ruruginisovekupigaw.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/gupusal.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2042edbfaf---67022242261.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/35903273160.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094438729aea---38458419234.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8fe1aff3---xezemavovirekarawu.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba77ce92e05---fuzalasaw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95ff976af9---42761449322.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/jiwesupaxefogidapazeku.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53d3453df---wogujaxar.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/fofegobaremiz.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/0d3da1b421b2e2ee46098c33379fc945/20597082328.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210606_094638.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/74084442845.pdfIn PDF document text
    • http://belst.by/upload/file/regidodabotepezukelopabog.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4a0fa1bcca4849091a9e2628152bf89b/kusulo.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/92140440620.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/81131801644.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/vibitoxujamevu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161309f0ea013c---87804261374.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/rimupefamelediwevidip.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i1pogpqkv5l1qjgk7ithl4lho2/wezotatidafudu.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/62061744702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=combine+pdf+files+into+one+with+bookmarksPDF 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_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 11112 bytes
SHA-256: 57c1c3987e26ab30a55c6badc82eb35a5f863bb102244484387749881e874f9e
font_01_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 17700 bytes
SHA-256: b1098d67050fd9d5c54d1ddb527abefc27a1bf9719ab09a13a498e66f274c6cb
font_02_sfnt_off00012fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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