Malicious PDF — malware analysis report

Static analysis result for SHA-256 21276d573801136a…

MALICIOUS

PDF

100.8 KB Created: 2021-09-02 18:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33147ab04d8eb096a971862917e19900 SHA-1: c688a5132d8d41a1421ce9a9031f989689d82b7c SHA-256: 21276d573801136a4761918f6360ad43afb1c85abb3b78900537351e3a7e2567
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness, and the presence of PDF link farm heuristics points to an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://melhi68.com/clients/69549/File/naxesukilexokadukisokoru.pdf In PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af0be4f88---56829500854.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c2ea12d00---52039407082.pdfIn PDF document text
    • http://travellerisland.com/files/96108625371.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8728494f9---xipovesadobigo.pdfIn PDF document text
    • https://medtek.vn/storage/file/jonuniwufakite.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/92868114622.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/pidutuminezasaxemolavunib.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88d7aaef61---34909242902.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb92584e179---20914466575.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/15366278787.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd93d9f3a---neraketofuki.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/goxek.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1c93773f5ee46fad14d45ade67c460a4/podiravetufipufidefe.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e21c0ac10---17644740719.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/47333348769.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/pexejadijebujomumukasaf.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xasotisajej.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/poxujizuvaxekawanigux.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/oid42tv0ooqd6vki6ua3mml3j0/72939614780.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/36819530248.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bbba0d5efa4d6ca6a0e720eeed2a04ff/45781478447.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/3eed1cf39576dbe0301c043623cabb99/susimo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h2jtcrqg4991htvkdbrqu65ime/46544860108.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210821101026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=western+union+form+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_off000123b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B3 10544 bytes
SHA-256: 5a75d239cec3d08efd1c4281901a5039f350a7777f66f40217a6e9ff291d9ec3
font_01_sfnt_off00013bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D1 18868 bytes
SHA-256: 5e7d18bf2cb3fba77e1578dd801d125e10b628a59c8b9e26cd1ad73adf5b01b8

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