Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8a10aa8d67fc37…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 04:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 79ac1f43c2ac7eec02d36ba8cfa7f8c1 SHA-1: c641447c23b550fa00c99eb28ff8016cc6730e28 SHA-256: dd8a10aa8d67fc379dff2f823b5a3531c435994c134c53ac14009d84975028cd
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest the document is designed to redirect users to potentially harmful external sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9627

Heuristics 4

  • 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
  • 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://fullx.net/files/retuxijowuzuripuzuj.pdf In PDF document text
    • http://heorungminhphat.com/luutru/files/kawaruxisewivoja.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/99790825203.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c83700c36---jusezisilijujivobaxaga.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/dofidejitodilexovejum.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/01e3a62949d66b84466ed7c7ff1c577e/94234462618.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/wumutajikomer.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd41264cf9a---64006769858.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f19be3aa8eae06828ca9870000a6d4d1/78368582382.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/zawokavakuwifenegewop.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118bb6b8ab8f---21936958054.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/3963406662.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/25674944553.pdfIn PDF document text
    • https://bliznacite.com/files/tidudiku.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/56662667970.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/vekifexowerimipajoburav.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/vomavetisemobubesezad.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/valenefopimovimat.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93d714fa03---57174287712.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wenamidenanuwarota.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de4a1d9b54---26087189705.pdfIn PDF document text
    • https://bio86.net/fichiers/18012692466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=goldman+fristoe+test+of+articulation+manualPDF link annotation
    • 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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 19116 bytes
SHA-256: 464a7b667489f9b880d140cbac007d7a850e1254b0d5081ec451985ea9580cab
font_01_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A5 10776 bytes
SHA-256: c6710f50073a06d9f700c2cd46e7bc15ba060dcc5fbae4777ecd40c542037942

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