Malicious PDF — malware analysis report

Static analysis result for SHA-256 9900d5954b19327c…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 23:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7632a0eeca70f4b74cbb902c7b8e0a19 SHA-1: b1be61a0a7c7d803e1e0d6e32ea3e796f664d1ef SHA-256: 9900d5954b19327c23ceaccd62dcaec43e395c52540dc20fcdb59e1c17e55221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised WordPress sites. The primary attack pattern involves luring users to click these links, likely leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8566eb8af4a2d0d0869491a16a8ba7c1/julezinejeve.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d9127a79c43ea3de5ecd77930f96f8c3/84619480826.pdfIn PDF document text
    • http://ossokahve.com/upload/file/47149781262.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb53df3ba46---liseviteginudiw.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0c9c2978eecaebc3c1d0de267d00fcb0/49833234676.pdfIn PDF document text
    • http://lex.tj/img/file/28881760858.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/tr5s17li9s7l5462cb7ftq3o4d/rerivirorosanon.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/6o9tpp8cimel48vp3m05ssoo1f/memufegixituvowo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/ae07413a5df3e5ad9574b1e54a8999bf/zudiwawiwodoni.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089434a7bf4b---kisopanuvagaralofuvev.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/63518874119.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/gitufegopirofiju.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vt0c19fhaa7bfv1n9hctfpskol/47856400019.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160821371b352a---rokalafenizimesut.pdfIn PDF document text
    • http://tion.hu/upload/file/kukoz.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/fqn8buodb9iu13rg04988k6lgu/9927099269.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/3684966313.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/gekexisilesufu.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/83204142598.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/65916615338.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/e31ee1bace4e868980b448d2009a77db/35849145645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=vwr+digital+heat+block+manualPDF 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_off0000bf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5E 11036 bytes
SHA-256: 8c86ffb19d8795ea5eaf17fc76874c2aead6455bd2719fc169e0af16e1578dcf
font_01_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 17176 bytes
SHA-256: 5fa35cd745eb60c2e50338d65455b21a6aa283784171d383231dda01ae3563d2
font_02_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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