Malicious PDF — malware analysis report

Static analysis result for SHA-256 6353d76beebcf188…

MALICIOUS

PDF

65.2 KB Created: 2021-09-20 10:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12c7633a2856001a418ca063e808cf26 SHA-1: a2992d71074e643c8c5ecdf2736412c5998e5ce6 SHA-256: 6353d76beebcf188504f68400cce53e9cf0c86b0dc2d919cc5bc1f254738a39c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9524

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 https://coretry.ru/uplcv?utm_term=gta+5+game+play+store
    • https://mimpiindah88.com/contents/files/tuwakafo.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/76938851365.pdf
    • https://vibingvibes.com/userfiles/files/96862212877.pdf
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/76663366753.pdf
    • http://serdceprirody.ru/userfiles/file/66180304859.pdf
    • http://woodlandhills.ilovepokebar.com/uploads/files/gatop.pdf
    • http://teedinmaesai.com/user_img/file/fivitaroti.pdf
    • http://dworbieland.pl/userfiles/file/61637730877.pdf
    • http://dailygameresult.com/editor/UserFiles2/files/putolutafujobusuba.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143218ccc8eb---zivozatenabivemudowavino.pdf
    • https://tigaintan.com/contents/files/nilaku.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/73eb00e38d55dd0e17861c6476a2e360/nupawizadewosul.pdf
    • http://videlec.be/ressource/file/48755074954.pdf
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/xezinozudugedokob.pdf
    • http://murasakijr.com/uploads/files/pulidida.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/kefavixe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614491cc7e2ef---996487987.pdf
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/roxuk.pdf
    • http://icmasistemas.com/userfiles/files/55588591115.pdf
    • http://namthangbasaltstone.com/uploads/image/files/wiloxoraroboxogesadubero.pdf
    • https://sakesushimn.com/userfiles/files/29158140396.pdf
    • http://fiumaradelsossio.it/userfiles/files/bibejitite.pdf
    • 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_off0000cabf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 16792 bytes

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