Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7976a0ed1e341b…

MALICIOUS

PDF

85.8 KB Created: 2021-07-02 00:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fa63a2b25b123039cf3b2f78048780e SHA-1: c2427450315612a92b654c3214f1879b2242eb67 SHA-256: 6c7976a0ed1e341b962eb5ed0f493d3f662ef99569712b4c76675f8b8fbbdb12
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

The PDF document was flagged by an ML classifier as malicious and contains numerous links pointing to compromised WordPress sites. These links are likely part of a link farm designed to distribute malware or lead users to phishing pages. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/poakcmeuc5l04vsjqs1f419qgb/81672515975.pdf
    • http://cocoal.com/uploads/file/mamubunarozitatajemovote.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/64180b4e9340c2d47e74c30e4af11270/51464815677.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d1c7a0796---88844141557.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb72d7f69---26960983126.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bewokavumaf.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf0d8311c---93949828010.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/1724494069.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xomeralipudafovowi.pdf
    • https://betenenergy.com/sites/default/files/file/bofedilebi.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080c27deb55b---tuleriniri.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c69be953ae8---10277384799.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/tp876eq85jpntuu7les7k66dh5/tubabepo.pdf
    • http://cocoal.com/uploads/file/jubasunubupewunivovuz.pdf
    • https://annjulieskarpmo.com/userfiles/file/kalozoda.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20f153572---70764414811.pdf
    • http://gostinica-domodedovo.ru/files/riruxuv.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/96706405501.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160797df01aa4f---xuzatilajuvona.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d05c97f6---68898411475.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2ebeee1b8---35610737897.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a6a0ceae64aa221d3f73d2ae4d02676d/85019779590.pdf
    • http://fernandopelosini.it/userfiles/files/ruguwolasipawedijaxak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chicken+vegetable+risotto
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e89c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE89C 16792 bytes
font_01_sfnt_off000100b3.bin
d0afdf8a34cf9afcdeb259f60e22f83ea14e87cadba011b53a542c7c1577bb7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 10840 bytes
font_02_sfnt_off000119bc.bin
4b1d21be29bf83e0ab55456c6bc96b7929575a48f47fd560d1ebc65cd8cf3a6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 18524 bytes