Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa211e47f0551ed0…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 18:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3c34243927e7b046913d308506cdbb1e SHA-1: f32aed49874227008393072a7b2253c66003a0c5 SHA-256: aa211e47f0551ed041af77e71b0a76f9490f6a7039b1216167293349604c19bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure victims. The ClamAV detection and ML classifier further support its malicious nature. 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 0.5042

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://tiramisu-o.com/yamituki-n/uploads/files/sijotedopusipaweboj.pdf In PDF document text
    • https://jagamimpi.org/contents//files/38798374887.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/kedenetupumiweraw.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c2e663bb8---37589275313.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6aef93afd---79698268380.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rofod.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/entspuu8eus7csb1862j5lehtv/wiwogusekosaxuz.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/rugimopuloxanetopomozimip.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/tupepifure.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/sozovuzibanolofupun.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/wasudejet.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/kolagefebeko.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/59401409745.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/sefamarigimagaw.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/44792103003.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c92c856f38a---jinikekixogimituvokegeka.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/zujebovabezekekuvazan.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/todurijirigujinuwuku.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/8899644774.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/16312463213.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/b43f8a157dc386d7d24dbafef37936b0/21211308789.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/df415fd8e8593bdfdc89d9719cd26d5c/nukubasonu.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/43217005817.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/zatonutapipowilalovonofo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072800e3c216---91266641393.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/r1t0utff5qmhu0v33ej65stm44/gewojisezatesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=english+activities+for+grade+1+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 17640 bytes
SHA-256: f42cb5d9129e03d3e1fe6c40a7783b82e55ba9e5ee1f9e5be7a8376ce25af9cd

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