Malicious PDF — malware analysis report

Static analysis result for SHA-256 447bfb84a79fe224…

MALICIOUS

PDF

79.1 KB Created: 2021-06-24 06:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fd11cecca7777dffe973fe4d3a4dfa9 SHA-1: 860e0797854060ea04a89c0a0a6909f9bf76a3b6 SHA-256: 447bfb84a79fe224e5a6b94bd42707b7cb5343f0f6aa8ce451e265ca1a67700b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

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 https://crysiq.ru/uplcv?utm_term=atr+72+500+manual
    • http://szkolka-wiercioch.pl/files/file/kexitixijupemo.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ijribp9sc5uva74mjelldat7i4/80382450484.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb67252cb---momukapijaluxaguwegudo.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92fa4b715f---27020679559.pdf
    • http://fzcce.com/aimgs/uload/files/71396876423.pdf
    • https://motelandratecuci.ro/userfiles/file/nopeguwejipexapelegono.pdf
    • http://banquat.com/userfiles/files/87132405136.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074961d1a837---7460151534.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97813e7810---50724717393.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b8c13e197---gidividi.pdf
    • http://baigeleather.com/userfiles/file/14230462456.pdf
    • http://dnepropress.net/files/file/16566022932.pdf
    • http://weberstellen.ch/userfiles/file/6557412142.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebed94011c---ziwojube.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ef.bin
f0ecacfac971554377e8dbd12423fd449c6a1ca0b04da20e150a840af872b464		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 5120 bytes
font_01_sfnt_off00010448.bin
ffcb70150206c1d9a8e906ce208131f2a2cf7e1d42df0b6849887547ed11e98c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 12996 bytes

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