Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8d497ef1aacd19…

MALICIOUS

PDF

65.2 KB Created: 2021-04-30 09:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59493125e6e1f907d5a4cc968afeed9d SHA-1: 6d695c5c3610c5d5a021c7a71eb1b928cc9a1295 SHA-256: bf8d497ef1aacd197a54183f3b463413da39be9bc1eeb11f0fa7f01711062b94
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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 http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4607d24d167bf3e115f76a5b914b807d/1917327477.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5b95f871---nuwasaxibigofatazowu.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o08tpp8i2o9et8hs986gkpcps9/wufebexolisabe.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ln80lfqse8c7mdp6o9g4nsc0gj/55982928998.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53234609ea9293bdb3d6533375e74ec3/xajotosulemuguwixen.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe133dc96---zusavanojifetule.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c0f59cf1506c974776a5f61572b843a2/81976423879.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4243f27ca50baab5a664527c219c3942/25916727382.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/olc4dfmner4ci0e1auj0ngi08c/depepiwunubaxim.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607948e7891cc---3405827823.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/u4iqmds8hgrc9li4au4qj1l5d6/61962320048.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b77c59e1---jefawodulosila.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0cfb894695d569c6b343987ff63163a0/wiwikorurinigodapinatiz.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3150d0457d54a64a2807847d30cdd90b/47663538934.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bead710a04---wajoxopu.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/12b13787cb00a3a9a6bd5a5f3337bf3b/vasojofidakabenon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+letter+to+hogwarts+template
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f15d.bin
1d0a1d4158ba1547f49e29d7297d216fc8e6723d06bdcdf2c4fb03fc6e7e11b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 5388 bytes

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