Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd67e54aaf4a5a2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 02:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58cc6fb1a2d6d811483b32a722c16fa2 SHA-1: d675dba138614c53163a30172ed6b300d3885da3 SHA-256: 9dd67e54aaf4a5a29aa7ded9cf12647f621c64e25d42da3a4b96c0a10c4562e7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vietnaminsight.biz/ckfinder/userfiles/files/bejon.pdf In PDF document text
    • https://kudamatsu.org/userfiles/file/viwizidinimumimawixeku.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b10911ac173---xutewagegubiramu.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/38768865462.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/45041647288.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16094077a483ec---bexajanimepawa.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/40895683590.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b63ccf9e2a8---17704042214.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/dalubizabijefogatuxivogik.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/nobubipobudadisonije.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/66372978325.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/77029822074.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109031454508845023tgwgjwyu0ax.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/nulosuwiwufuzugaladub.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083699d2f143---lumizipebevadazebelaru.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/99727328163.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cea3fb601e---5683546138.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac7429cae---10965247071.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082936a1732c---pitapude.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/41940995813.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071793735410---5275632631.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/240542567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=straight+talk+on+trade+dani+rodrik+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_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 17648 bytes
SHA-256: 2afb00266240db948ecc0eab201c8a5c4d86bfbd7988d6ed78b09387c0276d5d
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 10776 bytes
SHA-256: 138330f75a654aa4a0f5ef965bab82dd95afd4295e1ffa2192d2d1c4c6eb4205
font_02_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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