Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb64998dde7c48b…

MALICIOUS

PDF

79.0 KB Created: 2021-06-24 21:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 08fee96b6cae0e464a1fb99acd1e760c SHA-1: e01478a6faa1b5f6d2a72cb8f5496de72aa499fe SHA-256: fcb64998dde7c48b543bbe3e6255d93cca84bf128db005ff7f979a92ec5437a3
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the structure suggests it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8484

Heuristics 5

  • 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
  • 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://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085744154292---gevijufodetolodag.pdf In PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/dd36464b3b00ae4cf61fd8ad3a369767/63737821830.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098edd31096d---20832309406.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cc4d52a22---80716112327.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/323a0347923325825ddbbc366f8ead67/lemegoxagujawu.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/rodowejik.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7deb2bd0fdebe9f09cbfc221e9c750c1/35018469480.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/49056348361.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/moguju.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a868267865b---wegipekotawimofewa.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/28eedaeb47411d1da821b13c8c702a59/xupirimesufan.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/jetitupemefo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a28272b88b5b0b110628ed68bb0f9efa/17139636355.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/tjh9mt19t0uoldgcggldjhjerk/wikowiruluvajofekiganukem.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/6rqq0a50h0cg959k2bi4iriir4/kijasazaladepuwipedabuk.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/zuguxofawaxepilujuxosu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=quiz+questions+with+multiple+answers+ukPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 5336 bytes
SHA-256: 714959933da8f45e20097c562a430d22d412a804fe696e0981bafbd0eef2012c
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 2116 bytes
SHA-256: 316f78c6e162999e43ccb83d429ef85c46045bf1ac59c77d169faf589ecd4eba
font_02_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 11700 bytes
SHA-256: 3c02c315f20fb4826e3319263b465435b25b14cfe0a946de12331718a53276c4

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