Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f834219c914955…

MALICIOUS

PDF

73.0 KB Created: 2021-06-25 00:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f60ad7b9fcee4616b5fdc34814e9db86 SHA-1: 1ccd2790d5f4484848cf8c18c5483109e82a1c41 SHA-256: 54f834219c9149557e93cef3258125da77b9aaaa31665f27869744542c42961f
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains a link farm pointing to numerous PDF files hosted on various domains, some of which appear to be compromised CMS uploads. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious content or engage in SEO poisoning. The presence of embedded URLs and the link farm structure are key indicators of this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://truthtube.com/UserFiles/file/xineralebuda.pdf In PDF document text
    • https://pabrikangka.com/contents//files/guputevi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8ae42f1bd891c464b22d9f9d44f3e97/30366273422.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608526570185b---kevorijako.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/soromegopef.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/90975656946.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb7323e0d1---34080017878.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/827160eae32bee13e6c2cd32d0c895a0/nanunad.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gigegejabag.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607901f6696d0---gijufixepujojafufefakebo.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sigimotewizogusezikikufam.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5adf2de8b---64209805558.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32bfc1769---98890342805.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/99343911646.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/rofukefonewud.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106050302464703.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/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=x+trail+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 4836 bytes
SHA-256: 1e4fb529c50cb6ed4a97a490f1afd7be0277a9d70ea61a6f8a2d00635799f764
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 10448 bytes
SHA-256: 0798f4ff2e3cde722ab6d14cb1e39ca6a43646ce2a77de8dc21f81ac0e77d8cb

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