Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bc18e311ebe53e…

MALICIOUS

PDF

70.7 KB Created: 2021-07-25 08:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9688f05e369138274a3bbf853ea83508 SHA-1: 6fc15807aaa3bb24bea4b6f69b17f6c751afbad8 SHA-256: 48bc18e311ebe53e60d179bdb8e1f268c4e85f67fd90ecf5aa86803c2b84c5e6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://atol-res.pl/uploads/file/selibamofupojizu.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/35905951587.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d072ec78d---3701590006.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609484277a262---98116202108.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/f37eb6b3eb75424ab1130cb0dac0d077/vimokuwozifufokoza.pdf
    • http://chromowane.com/userfiles/file/20413406836.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/23665333370.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/465f229020895ecec9e7e7a9193cfc72/pojomunowafokevixofavu.pdf
    • https://itexpertdog.com/upload/files/pelulusakugetololofi.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/79357525289.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a869ef8e26b---sigewuramaf.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608620fde4d1f---15089023150.pdf
    • https://spiuruguay.com/ckfinder/userfiles/files/12310303924.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03ee10784---kujupamedijodovawitoser.pdf
    • http://perles-del-beya.com/userfiles/file/fawujelobo.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccff4a4b18---tunawanawazema.pdf
    • http://fujavietnam.com/images/Download/fupolugofanolisimojovab.pdf
    • http://tmtechvn.com/webroot/img/files/67406699196.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160877051a6280---jasemunakokiwaf.pdf
    • https://smartstone.ca/userfiles/files/natimaginogosot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+turn+on+schott+ceran+cooktop
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030e.bin
1310caf8a832d9e722e59e9823f465ec09a6e865bef357fc3cf728204676a65a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 10604 bytes

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