Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e85debbe474b8a…

MALICIOUS

PDF

63.6 KB Created: 2021-09-04 00:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a291d55b92ae52af79d585768dde81ea SHA-1: fb8c636095816a4caedb90bfe81465daa5ce6cda SHA-256: 41e85debbe474b8af7c3e7841a93f43b2da1fc40cdcbb93b7021cc200445a39e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6241

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://soosekszer.hu/upload/files/nonijuw.pdf
    • http://haki.vn/uploads/files/66165791150.pdf
    • http://bagliodeimille.it/userfiles/files/29707412935.pdf
    • https://resttour.com/images/userfiles/files/wimikizelenovadonijin.pdf
    • http://www.deep2001.com/images/library/File/78240209175.pdf
    • http://hocikto.info/userfiles/file/37721908033.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf395a695a---xokubobawu.pdf
    • http://alltechsro.cz/files/55466253875.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbe616937a---rurikizufasanizal.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dff6cd4d3---xoxejere.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/minibed.pdf
    • http://alphasigmaoverseas.com/userfiles/file/foxamejuvipobuwavafubaji.pdf
    • https://bestcoloringpages.com/userfiles/file/81906549825.pdf
    • https://luminex.pl/upload/file/63800537996.pdf
    • http://grapevinewinerytrail.com/clients/876125/File/63373023078.pdf
    • http://malabarisproducoes.com/arquivos/files/53654619573.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a76d6f6063e6d4d917844b7df807d01a/26399407122.pdf
    • http://infrabud.eu/fckpliki/file/22433429951.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/kikilol.pdf
    • http://kleinschadenexpert.com/userfiles/file/53100399585.pdf
    • http://stalmost.pl/userfiles/file/wibotexubulokizujosego.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ec5629354a4a69cf5bf182cd75d35323/gafurafale.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/16554236398.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cbt+worksheet+for+social+anxiety

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