Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bddfa396e9cae1…

MALICIOUS

PDF

93.1 KB Created: 2021-07-23 21:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2b04a0cf817edbd563f7e1afe1651c9 SHA-1: c34c7e59a9c0910a0dbe9e540ae4e4944432c9bc SHA-256: 35bddfa396e9cae14d51afc764a9def161a6bb6f9f85604f5be237fb5b533e77
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://casaatlantida.com/userfiles/file///gumomojajumix.pdf In PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711c71348e1---73849579694.pdfIn PDF document text
    • https://rajakedua.com/contents//files/bivew.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf3530c998---kezininovijopavexemupu.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/46169705315.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/85165008018.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/ninujutimoditur.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/61d471a146af5ed77a7679ab6dfa8dc9/27278960400.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7bd965d36---60013283755.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1cf438268---41838806840.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/piwutotikoxu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f7691cb8---12104539539.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00ebe09f7---rapawagerilepa.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2ecd5c8d043cdb27c58c27e81ca86dfc/79488653937.pdfIn PDF document text
    • https://tekartltd.com/upload/files/roxotasujixuvapimizabusus.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2q84c7ks999atdgek83qh4edrn/68340926884.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/kigovarunuxo.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/rifijufefudalukijunusuka.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/3012575393.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/87288460735.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/41681906570.pdfIn PDF document text
    • https://activepymes.com/pub/file/mejuxomigo.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/ponusavuperasenusil.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/senilubisare.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/mirusibemusofipotozexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sustituci%C3%B3n+de+fines+de+varilla+de+puerto+ricoPDF 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_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10992 bytes
SHA-256: c84bd60695556b0691d3aaca409d9616a518940007bd6380659188a1f16a38df
font_01_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001369e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369E 16808 bytes
SHA-256: 4cbd41ca258024686870f430ffd1c69540a3c171581a7456b1e2178c71675f7b

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