Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6dcb518a93ef2a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 10:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b730ce4ce65dfc4ee590ec407bebd122 SHA-1: c8a493adcd8b81c801d5b8ef607ef9e463b3f9d8 SHA-256: 2b6dcb518a93ef2ac097fefac02072dfc1c45e850b1ff8d802a50d77d5fc7589
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it's designed to host and distribute other malicious files. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm on disposable or compromised hosting. No scripts were extracted, but the structure and URL patterns are indicative of a malware distribution or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008369df7d0---26011234785.pdf In PDF document text
    • http://madmojo.com/fckupload/file/77421641359.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/lupozudojibinepa.pdfIn PDF document text
    • http://373113.linker.tw/files/10171581624.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e1564942d---pilutapokobetasasilagiwib.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1046469133609b6b7997072.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/87886501685.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c37ca9bb---dikizatinenep.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/43626455601.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/61348543239.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/2600982251.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c68c1a8dcd---72936680554.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/45092244722.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/fegapuzowoxijifatapa.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607396360a501---biwogufesugalaretevuxesa.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/11960642647.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/21836088287.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/mavokure.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/pewarux.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9820295ca0---44741056490.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/92fl6s5av34ics8bitort6n6sm/82356937840.pdfIn PDF document text
    • http://farmina.ru/uploads/files/7543609292.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a8347df4b3af84d14da00aa3c1075882/84299087808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=opel+kadett+cub+workshop+manualPDF 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_off0000bb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1B 11132 bytes
SHA-256: dcdb1526765c49d52b0312e7366429d20be2a3ab7ed07f82ac9c5723781da75d
font_01_sfnt_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 16920 bytes
SHA-256: e3e0de7bfcb038f2ecce7958b9269e23b9391f1b789f7a85f2f0971c8de18225
font_02_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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