Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c7f75d9c2e1f7e…

MALICIOUS

PDF

71.7 KB Created: 2021-05-17 00:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb0acf6033f62f9c2992da242709474d SHA-1: 7458b857d3bac5a0dd1b20008bd52685603682ab SHA-256: f8c7f75d9c2e1f7ed33c343c20a80ef68f45c6db5af3123210983a8934421581
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body is heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8607

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=adca+ka+full+form+kya+hota+hai
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/e6fh5np3tl3rrt1qhuirf07ibn/xosapopowovufigizi.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/504df9ab55a718be5b108739dcd06c92/xesepap.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d51395cdb3a3e6aa4f9f8061f7e0aaa0/1686760564.pdf
    • http://alituncer.com/userfiles/file/genol.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ab87c975d6e33333803093fc2edf38d1/vugikaw.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/9631e43d3b310f0bfc857624e0a279dd/vetufuxagowag.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f15ec223c2---69277188674.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9087dec3---53360117112.pdf
    • http://yilip.net/userData/board/file/dusosikipawora.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd4ad8abf---60057261046.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3c912a6c---86828650842.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d68708f39fb25953ccc6083c766978c8/lozaxemesimoredafafatadu.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f4a64c20d68ba0daedd9eb5f5d662a36/kavolisolodunezozuwubozu.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160801a97188a7---mubawulapajovegego.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb3.bin
6253f9d947018eb13607bbe75e8d0e0118129cb09259bae12fb1f7572c66de7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 5240 bytes
font_01_sfnt_off00010066.bin
4df4886b4e6d6a2d7bf5203ac503bc5b607733af639afd92e3d2228876b82abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10816 bytes

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