Malicious PDF — malware analysis report

Static analysis result for SHA-256 090bdc92b03c0c12…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 10:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4f7c14689090acf46f985d4b266e8b45 SHA-1: e7bfaca57c95147bcd27ade730d2e3144d3219ae SHA-256: 090bdc92b03c0c12afe33c87cc4070c1631eb56fc2ce657897afeab2774957af
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS installations. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to potentially malicious sites, possibly as part of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pneusmarene.it/images/file/jugifut.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160926d4406423---87508176068.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1ac0f6d79a652788e6e835d429ec2e28/59753289405.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c0d79a21---73418139559.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82bb3580bd---natajepojusoxelisimejamar.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fefa467925---zusetumerufokarolutovot.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/34036954046.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5bfdf4aa3b6e055e0ccca6022037ace8/zaguxulovigu.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/soloxetewadupuvovapulubi.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/xenabosomoralasorugameda.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/jukabikaxoriminadiserero.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/zesatumoxed.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/43837337161.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/lexikavasixodizof.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/34952857212.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c659d6d93e---41151980568.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qg73oj6v7gnijcj7mp1labr103/44871341619.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/8798730380.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a245fee653b1f971d1c018202296ed7b/vesakid.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a83bccc4853---7974177909.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/18312995222.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c6f13d1f7799547a61ec5b02c1819aa3/rulaza.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d273ec93d5920219f6fb2df6a1037c5d/45474283124.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/u1m3bi8q79hg5c0egfhgb0noat/tagoguxaxefumaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ethology+notes+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_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 16948 bytes
SHA-256: 5e58c6f6dfa468bc3b677b2f439b7f1a7578f1ededaee3327f55a3e4c5ee11b7
font_02_sfnt_off00012356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12356 10520 bytes
SHA-256: cf1c9d8b11ea2f196b36247d75498ff2e8bac87747bf9b015321ad6821ac9b16