Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f037c8f3c70b27a…

MALICIOUS

PDF

39.6 KB Created: 2021-09-03 10:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 15ad3d2e8e0db8359fa37022a7b22a97 SHA-1: cb390517210492d5dac917b90d65f1f1f22c4c41 SHA-256: 0f037c8f3c70b27a3c7e36ab246c442574ed73dd88c6b7a7831e984ffbdafba0
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8883

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=namaz+dualar%C4%B1+ve+anlamlar%C4%B1+pdf PDF link annotation
    • http://bjaimama.com/data/upload/2021/05/file/202105140534484380.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607483498617f---79192441772.pdfIn PDF document text
    • http://erex.hu/upload/file/zejapewedirubogizelujepu.pdfIn PDF document text
    • https://egf.tw/test2/images/file/98201727022.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/99359786029.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c97b5f2a2d7f0953b003b33147fa48de/lukojumujesotoj.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/10533624620.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16114c0d937a03---lobopode.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/48069494152.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/biragozojubawuniburisaz.pdfIn PDF document text
    • http://firegallery.ru/img/upload/1507599114.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7a6b3c06---37677932210.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/nunelumomomawetiti.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fff147d92---litunobefejakolarixej.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/kobatetokulaxuvejogumek.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a597a3250c3---vinozevajipewifebepawa.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/9683792641.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099f6a5a3f57---48017247200.pdfIn PDF document text

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