Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d028c89eea73c7…

MALICIOUS

PDF

70.7 KB Created: 2021-06-12 23:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c99d9fa0354702831caad989f01814ba SHA-1: 5cdca785771cea7b023fb436bad6d626f126c552 SHA-256: 18d028c89eea73c78c376cd3d328f1785ef70b1d04d63c19afa1ac2a5af7f230
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious PDF files. The document body, though heavily obfuscated, contains keywords related to free PDF downloads, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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 https://pixomot.ru/uplcv?utm_term=zoom+istvan+banyai+pdf+free+download PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608776577d505---demorifovemagiragome.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/86330561dfaac2b2c4678591002dffab/83148347639.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/6fbd09b86efef6328f426c68cde30cc5/10313046197.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a1ca3f29---lixuzivozimiwuzusobove.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ths1qmjgpt0pfk19hlu5nhlvds/liguwivegomebukaron.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fipidbm17cr47e2mb0noq2at68/67006243491.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3h2q5a721rn4prkv9313i2knad/delivitu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e232ba75c---82184341317.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/vc1o01lqi5nf6oae376q76kdj6/zubaziruzefaxoxibib.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/abe8lkea6cnttorbmg1k33mboe/29956254716.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/lurivujukeji.pdfIn PDF document text
    • http://robalton.es/Albums/images/file/%5C/fopasapulidanopakor.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file/%5C/vikajodepubanobavuko.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9420cfcb---dufokifutijukupazasokejod.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16099b768ef029---batipiruka.pdfIn PDF document text
    • https://parfumzone.ro/files/file/wudagowumaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 5540 bytes
SHA-256: 52b3f2e4f494cf2e5ee386258ee903560db8cc7c6e3bb176bdf8d09909afbf8a

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