Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe9e5e7549d4d9d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 02:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5bcbebcc388f2064c890dde690dd041a SHA-1: 9242040b917293c62ca3a9a5a037eabcfcebff6b SHA-256: 3fe9e5e7549d4d9d9ced698ac83231bfc5edcbdf8bd0908730db196a2cdaabed
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to appear as legitimate documents but likely serve as lures for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://etasystem.net/userfiles/files/25069124894.pdf In PDF document text
    • http://viethanit.vn/hinhanh/file/57380442651.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135054c46a73---ferexaza.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/89245947895.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/zuvobo.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/dekoxenojagemijinuxevuwo.pdfIn PDF document text
    • http://samtekelektrik.com/files/83563322002.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/10548638231.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/15053134873.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/pojuzalobejipakomejoxej.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/14dae1e66c4270a7d1ee3e2959785340/92140280647.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/15068531845.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/15833340478.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/veguxe.pdfIn PDF document text
    • https://ferropula.hr/files/bitiwapumis.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/bafam.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134cdc173ff7---27302867042.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/sosoxebofubuzeguwasefu.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/8740021962.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/tawaken.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/davunuwej.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/mewuxupater.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/8596538906.pdfIn PDF document text
    • http://ihdbd.org/upload/files/pavomonogusuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=game+android+populer+2021PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/19307213512.pdfIn PDF document text
    • 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_off0000dc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 10720 bytes
SHA-256: 9decff74c7f4e3b63a4ef17a8184c0a73bc244363c45cac7349bd0a4db3044b3
font_02_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 17284 bytes
SHA-256: af4584ffc5a39e701ae8dd2bbf0f001fc6d298d0f2d8ec8f192c634690738b6a

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