Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5db486e50e5a46…

MALICIOUS

PDF

76.3 KB Created: 2021-06-09 12:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2597c65878eeb8ead430961b0d430c90 SHA-1: 7eb406c041ec81d8c100db7065952a93b0744ef9 SHA-256: 9a5db486e50e5a461e9bcd424f575e3644ab917c70326a43b966e914e1f6a5ba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism. One prominent URL, 'https://crewmak.ru/uplcv?utm_term=instagram+plus+latest+version+download', indicates a lure for users seeking software, likely leading to a phishing or malware download page.

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 https://crewmak.ru/uplcv?utm_term=instagram+plus+latest+version+download
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080be4c482be---99915554428.pdf
    • http://dianacb.cz/userfiles/file/kagizopuresewow.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/lewopirepemaleradivore.pdf
    • http://shuswapladystriders.ca/userfiles/file/kebigoxerololala.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/98398be42d271aa344de9db5fd90debf/vatowinagawekezemotiga.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acfd428f52---49784983919.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dsef22psb6e3k7d46sij3sn851/dolevixitobo.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607841d5a482a---52441012457.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af92ac64743---beropuvonob.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9bb4cab1---88504559968.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4v544i51triq6uqra1pieemt8q/bopuwonesonelusiwo.pdf
    • http://thankschicken.com/uploads/files/68452800461.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3920a780---19944949614.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba0a0dc8a---4401449048.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_off0000ef4a.bin
792d17f8a1eae05802d705738048190c00dba6d445ab1e24b005100748c8d16e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 5368 bytes
font_01_sfnt_off00010189.bin
ed6bfa5c941361aceb24eb0df71d73bb34f4654886b29e18a55b92c34cf5601b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 10212 bytes

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