Malicious PDF — malware analysis report

Static analysis result for SHA-256 d693c2ccb4150eff…

MALICIOUS

PDF

86.9 KB Created: 2021-09-21 03:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04fe0789fb0832acaad92abbac4fe1fa SHA-1: 88be1c0a68cf5f830178335eca3b8e1200afad81 SHA-256: d693c2ccb4150eff3b38d2b0edcd626c620a87dfa8b4e8385c0233e4b9ecbdee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=comparing+ancient+greece+and+rome PDF link annotation
    • https://wonwon.taipei/photo/file/20701422142.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/v6iic6c13qd777etib408r0dr7/47469171957.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/perifulimatev.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/nojozejabufalita.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/74322821640.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/62685168473.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/vipamoxevesuti.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/21/ruvuropuxuwukubis.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/8296484364.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614014a5601f0---fefuvurujefibijanuwuxima.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2f6f69462dd803d9f26b80b0eab2eec4/77085485278.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/42803201833.pdfIn PDF document text
    • https://kawanmto.info/contents/files/pikelevek.pdfIn PDF document text
    • http://contextuae.com/resimler/files/zivazetu.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161465ea866a38---28426687710.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/86233569329.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/1955847242.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/55159912144.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/gakekukakoj.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/funarav.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///talokosuweruboxozerobiba.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c723d9f90---pibalaxiwowewamerovosera.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614815a299bfe---kanan.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/gotugefaxonunigabipo.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/5dca33ace52da3e8a212b551828c2cc9/vuwixipenosimesaka.pdfIn PDF document text
    • 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_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 17440 bytes
SHA-256: 122c29bde50104902e6d72ca0bbb0dad7a67f9bdf2dc9ed488c08b5187f980f9
font_01_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 10672 bytes
SHA-256: c8770d25cf782a363dfab61e736e66a600d748e577e5169689cb8c4538243daa

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