Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd25d00b2d85cf5a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-01 16:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb0ad514d5e3a940503005943f003ba9 SHA-1: b3b5b1f4d49fc1134291bd6f8ef59123a7515c92 SHA-256: dd25d00b2d85cf5ae5ad346d69af720056a2db289f1092ff14f4cd3759f6c325
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://icfas.net/icfas_new/dev/ckfinder/userfiles/files/vutesaji.pdf In PDF document text
    • http://backupcenters.com/userfiles/file/93711342809.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1365a96f5ae544104ce37c7511179ad6/xogilipixotetagaso.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16125645904f15---duzebaneriduradimeg.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e404cc54d---zanejujeze.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad35abc3c---powegevobesuvuxomeki.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ac84c6c6162---89225297868.pdfIn PDF document text
    • https://sy-tech.eu/file/21883725042.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7bada9b105c72ab2855f0342bfd7c2bf/jikoxagamamodorubaduwozon.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/31245702758.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/41966485419.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0rrm580ffs11jvsrafe6b34ss0/11826196417.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/54ae3061e58b37c5af5959f7bab03868/davapuzejamoba.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7af7b412e---35388194494.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/cee7c3f4804f9d890191f2eb7b4a9c71/dolivu.pdfIn PDF document text
    • http://www.siposferenc.hu/html/98636952908.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2q1m5uqvgg4pms0uurbur9apid/36871398330.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/84026903262.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b650dd865---tepolavepemorise.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/7465808939.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/mupitilotikoxubume.pdfIn PDF document text
    • https://msiutilities.net/documents/89743624562.pdfIn PDF document text
    • https://terracell.pt/images/file/javokupobatewotarani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=i+caught+you+simpingPDF 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_off0000c203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 10708 bytes
SHA-256: d5b5ec27f424914fda1681e8190b917c50e5ddc49b41e79c396a5420816f1e4e
font_02_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 16712 bytes
SHA-256: 0d246cee7310a5331a20fff8628a93d65ee14246a173e647b94a0e719a756581

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