Malicious PDF — malware analysis report

Static analysis result for SHA-256 6febdd3b63115a6c…

MALICIOUS

PDF

77.0 KB Created: 2021-06-13 12:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c29a4141f729532c44217433380f7f7 SHA-1: 1703b03e6a098d036091325acef3c333d11d5808 SHA-256: 6febdd3b63115a6c648f0fc8afca63f0523561413866fd23b36e9925ad9ca889
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=fibonacci+sequence+in+pascal%2527s+triangle
    • https://harkakotony.hu/UserFiles/file/23454112447.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f39985a0bbe496f9be7e0a5c924e00b9/71613737516.pdf
    • https://laplacedesstores.com/upload/file/10906088228.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2b34b09040cb9bbaa93d398155e026d3/59826614778.pdf
    • http://sakuragiramenandsushi.com/uploads/files/tomamalexozudomubewopuba.pdf
    • http://dekoblickfang.de/userfiles/file/bifemamitake.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/78942956382.pdf
    • https://susta.vn/userfiles/file/95540025473.pdf
    • https://loyallcanada.ca/editor_files/file/76056102816.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0fc31b3c03aff45f8f86f1bf619734ae/163589996.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de34a42657---89666475490.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210609_BEA6CA722785416B.pdf
    • https://webmenuplus.com/images/file/manifud.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c1a68a6383d884ebaec96de4e342ef06/wijisimawo.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a29eab6383d---botenebo.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10d9e1bf9e---wikiwizutatuj.pdf
    • http://sushi-belovo.ru/files/32231604496.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01d.bin
af68e5b1f937c352b93499d49ead012793058d2d46d2f20f6aa811b6a9aa50ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 3368 bytes
font_01_sfnt_off0000ec39.bin
6a4e8126acc6c3edfbff6326a0fcaef1392d43d738abd161ee76a1e04c73631d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 5356 bytes
font_02_sfnt_off0000fe82.bin
5ce7373473a81e2a5511b5713e9fa3b141f9653f38ddf1e09adacbc397cd6c4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 11876 bytes

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