Malicious PDF — malware analysis report

Static analysis result for SHA-256 4395680d8c6f8e13…

MALICIOUS

PDF

51.4 KB Created: 2021-09-02 07:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f919e1888cae9b5a6c9adf6c4ad69409 SHA-1: 220b2feaa66d483dbc14d750365ded793c2e7887 SHA-256: 4395680d8c6f8e13542d647684a5fdeea4fa1e54dd313aede9b536cb4a239338
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting. These elements strongly suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9262

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://huntic.ru/uplcv?utm_term=modern+control+engineering+by+k+ogata PDF link annotation
    • https://dreamscapes.ca/dream_scapes/userfiles/files/lidijazepofofa.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zitizozab.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/db61abdf9e62f04fd6d4ab048de28c4e/74658287174.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/67933060034.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f077778fc56.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0c174767185b89f60056a655790cc471/90484304795.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762f0407ed9---48173421440.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/267406648115cff7fa828c3a62c731fe/89120291717.pdfIn PDF document text
    • https://mauspro.net/upload/files/divisumuxepo.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/lumoduxobogujuwabofer.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/sotaviselapifevika.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/xosatunozubin.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/1693f0148f811077cc0922d12110e461/lokoparagufomi.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/23445227721.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160711ffee9ac0---posijubipibabukivinadevu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6353c7bc63d3f1ed00dbcc6b3bef1923/78527485110.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/xovomevewojarawasasumun.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/sekoz.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/94507452421.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6ece5ba3a---82216992644.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/kirc225a35gvt2fsaka5t3jih5/32704321062.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/74333659271.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xamovizodowuxuj.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/22463508359.pdfIn PDF document text

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