Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8f5e1f934eeb1a…

MALICIOUS

PDF

42.9 KB Created: 2021-09-16 07:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb1ce3db9fb036ac3f5bb9d55f312b79 SHA-1: 440868ea1d5a7a13e49407920a8275ef39b40525 SHA-256: 9d8f5e1f934eeb1ad21d35ec5d7533439708613b52c25de72af55b61261448e2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only content, and embedded clickable links. The document body is heavily obfuscated, but the heuristics indicate it's designed to trick users into clicking a link, likely to download a secondary payload or redirect to a phishing site. The presence of numerous URLs, many hosted on compromised CMS platforms, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 42 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=insidious+4+streaming+vf
    • http://dichvu12h.net/userfiles/file/pozufedanuw.pdf
    • http://sprostredkovanieuverov.sk/res/file/38202930646.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1abc6a59---18194761688.pdf
    • http://azseal.net/uploads/userfiles/file/37173204493.pdf
    • http://brkvinc.com/userfiles/file/kazifelobawadumenisoritof.pdf
    • https://sport-jicin.cz/dokumenty/vazemovupekepejo.pdf
    • https://dulsuc.cl/userfiles/file/nazajafanugamupatajakoked.pdf
    • https://tigapilar.com/upload/files/38706758985.pdf
    • http://noithatsah.com/webroot/img/files/piwowivukarumawapalur.pdf
    • http://petra-koparki.pl/Upload/file/57802551684.pdf
    • http://pazarziraat.com/userfiles/file/kumewanonalomojux.pdf
    • http://skinct.com/upload_file/file/Fl202109011405287067.pdf
    • http://phamtrangia.site/upload/files/40654850528.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139caf6a1a17---vesezonoxebulunifo.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371cd96b0f3---27812651570.pdf
    • https://mimpishio2bet.net/contents/files/forerodejakawe.pdf
    • https://alternativecarrepair.com/userfiles/file/nanenanalunabofilateporer.pdf
    • http://nhasachthunam.com/upload/files/meloz.pdf
    • https://opescom-store.com/uploads/FCK_files/file/21969006726.pdf
    • http://cuiquji.net/d/files/17462133765.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc870fd68---wugenalevageboki.pdf
    • http://ty-int.com/files/files/91184748416.pdf
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/98037986969.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d6b9c041401912b5e0fe7f3008f7b63b/wobexura.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/869915dd5f0a3cbf16f0abad7fe4f559/sukik.pdf

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