Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8c62e923af0850…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 05:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85a7d86818e6a93a293ef59ab9095d68 SHA-1: de9a0378bf4bfc0e9953f609d6cbdf6de7954ef9 SHA-256: 7d8c62e923af085053bade90dc1c2b07ed0c3e55a7d3908d8a2360885dfcfa45
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous external links, many pointing to potentially malicious or compromised sites, strongly suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiocalcinoni.com/userfiles/files/70460678333.pdf In PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/80789508218.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/276147206.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/jedimib.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/mokafukonomaxutuvotaba.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/voxugilowonivamonuban.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/13cb1a7742fb67833f3e4a09a3f19492/76829381308.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/veboxuwekarigubefo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/20998895307.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/37226679970.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/sogewevepufa.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/jibatuzupobujabavadezize.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovi6uau1aor57v7jg6vggs78te/toragus.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210907153231.pdfIn PDF document text
    • http://terrietanaka.com/library/files/70782178565.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64dce4a0b---jeruwajirewuwigixi.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/rabopatogelekoragil.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143ea65ef8eb---60785029366.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143342f9f9e9---jivapus.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/63265341116.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/10166318804.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/68812563315.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/20618150900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=4g+only+android+10PDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC576 10296 bytes
SHA-256: 21dd318e905f3c898bab1b4e6303fa4d432163b373f2f2751e26bdfe7e9581b4
font_01_sfnt_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 16424 bytes
SHA-256: eb2746c4459cbae69caa81f77f9fe8f582afd09de9029b0aeb5cc523d2af3b78
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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