Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c9ed43e2b00f19…

MALICIOUS

PDF

43.1 KB Created: 2021-09-15 19:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2db9e6bc92911050ee9cd0f36b5fce2a SHA-1: bde77844d8b6b4cbff32f5717e801cfa90c0c639 SHA-256: b8c9ed43e2b00f195ede71e954de2e6e69eb5ea19ea0552a8c96f9a8089aef69
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 43 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.
  • 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://synerhu.ru/uplcv?utm_term=faraar+movie+download+720p
    • https://angkortaxiservice.com/userfiles/file/galakukakidebanusel.pdf
    • https://fsreloading.com/userfiles/files/99768385158.pdf
    • http://summitremodelinginc.com/userfiles/files/5458085644.pdf
    • http://lnianemarzenie.pl/userfiles/file/lozexobakanabuwosoxim.pdf
    • https://dursunguney.com/userfiles/files/levujibene.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e29e9a2fa---vubinot.pdf
    • https://fetogram.ir/images/upload/files/19615792310.pdf
    • http://photo-ostrov.com/ckfinder/userfiles/files/61264864947.pdf
    • http://thuduchouse.vn/pics/file/56144127078.pdf
    • https://hotelite.in/userfiles/file/ruxelerijowazitunowuwux.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/32511623725.pdf
    • https://deepex.hu/hirek/files/jebunadunawololupefu.pdf
    • https://tasivn.com/upload/ck/files/61674138789.pdf
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/dijoref.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/tojakokexevaj.pdf
    • http://matras-devison.com/upload/file/magefetekopokisevenik.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162c448ff0---repamunasumusiju.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/gatelux.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rh23tr183omvr68i6ga6rj1qi7/39001127648.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/wanudin.pdf
    • http://plusk-car.com/js/upload/files/86747735277.pdf
    • http://ijfbn.com/editor_up/laxubisawilijawikedujote.pdf
    • https://autonoleggioassereto.com/file/rozowikifosegozeza.pdf
    • https://hnhaa.com/userfiles/tnejp/files/70684307174.pdf
    • http://speed-r.com/js/upload/files/wiwotejikix.pdf

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