Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de0a45b416ea6a5…

MALICIOUS

PDF

62.4 KB Created: 2021-05-15 19:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dee40984f7529ab5530425fa2dbb9b2a SHA-1: 2b276f3df1932cb1ef943ace94718c79d9dc08d4 SHA-256: 4de0a45b416ea6a5787a10d4af7725d3c5aec24596458eb3b8e18e50096875a2
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous embedded URLs suggest an attempt to redirect the user to malicious content, likely related to the 'Steam keeps dropping to 0 bytes' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 4

  • 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
  • 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://alkanboya.com/files/file/%5C/73600481939.pdf In PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a2s7kva0n6jbt6copq1b18aa8r/sodoba.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852735a2547---13109626933.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/nawatog.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/cf252cd99c79255e6a02280e3e89e3a0/katexogeje.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076421bbacbe---totajuberozu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0f073594---87534328401.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16075280280c37---50743761508.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608951fd85bd2---jogidazodufofajilodin.pdfIn PDF document text
    • https://tavio.ru/files/file/lifulenidatovuwiroxikum.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/35fa98bf1517fded6bb2483d3b3de070/dadusarapoxeritipuf.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f8576219---desonegeko.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/xizulowex.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2e4fc207ccd40edfa578f686c5474f3d/juvukivanixi.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/7996a17750473f184a5fa0c8ce726254/64700421277.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607879b24ae09---gapulovakakosafikapipiga.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e514ff05---jobonu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=steam++keeps+dropping+to+0+bytesPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 5796 bytes
SHA-256: 8e1deddb6418db4b1dabe2d63573164acb92fdac261e9e69e2c2edf1d7770637

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