Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb81c39edfb678a…

MALICIOUS

PDF

54.2 KB Created: 2021-08-23 18:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f46a87a0c5788a756c93611872ff3e15 SHA-1: dd7a98fc16a40137a661ca06b6549d2f73b5f9e3 SHA-256: 7bb81c39edfb678a36d7a41ed5d1b38aef3f07cb866eadb8c7dcd542828449a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9600

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://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/bnn2csds6f7kv35mptajm99bja/34897934400.pdf In PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/sokadabupapatipumawane.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079c5a5dceb0---nopakezivovas.pdfIn PDF document text
    • https://rinducm1.com/contents//files/53144694407.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/87602173310.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/3378507518.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/78628197962.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/31301358123.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f55d5508376347ea788fa4f66eeeb99/mujemogor.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ssfon8n7upb2cfusih2fuqk8a7/88838710843.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/63cd947c26b75cc75f03d518e5a09e91/25714883769.pdfIn PDF document text
    • http://heatkings.net/fckpic/file/63080037854.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/45573971385.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7910d8a18---98487825054.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716691e8677---30781567510.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/64890419672.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/xamulepadofavo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cf2984ea956982292c01766a6a1589d4/foralabejojux.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/gufogudubeluvalimif.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60f751bc1---48192510319.pdfIn PDF document text
    • http://uchid.com/uploads/file/zomanipevigebujir.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/65151jf1fljgon4i32gj9kstis/fazezidisalidozopejakuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=title+for+house+salePDF link annotation

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