Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa664c079366f61…

MALICIOUS

PDF

75.5 KB Created: 2021-05-17 11:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14e72c222a05408a6d3ae61669f6de7e SHA-1: 9cd6fef8cecd3f8204613f41b6c8e1125808c053 SHA-256: 9fa664c079366f61b5ab49191c681f017e73cc7af9ebe61e0b84fed3d229d7fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and compromised CMS upload links reinforces the assessment of this file being used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a204839b7bc---dufibov.pdf
    • http://domeinbeverdonk.be/assets/files/file/81858273665.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06bb9df24---repazevunabebewog.pdf
    • http://curry-box-deluxe.de/userfiles/file/45986623753.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c04861f549515508a838bd415918776b/87144791051.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727732a1764---40364812408.pdf
    • http://aftckwt.com/uploads/file/94258879886.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925af38ccf0---lazunoginabi.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22995873f---12751909171.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa74930e9e---14196992826.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/ef4d36367308d75a962a9c54e172c7a1/tavezetekegomuliwa.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160732a77be3de---76368337646.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/b77dpvn0c34hg257866u4uc7eg/powomopuzitevo.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703c82e438f---62297537023.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=jacob+collier+in+my+room+sheet+music
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a532a841cc---33803192642.pdf
    • 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_off0000e6fc.bin
735dccbcdf127986d0a48a62dec218a023f4c2df74a3c90d65d646ccf42d54c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 5268 bytes
font_01_sfnt_off0000f8c3.bin
d6c39c8ea8592afdec6e5cd559f5d4f6b45abf3eee51017870e915d18f617be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 11744 bytes

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