Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ce036a066176ca…

MALICIOUS

PDF

50.4 KB Created: 2021-10-01 00:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 260dd62b3efa10a83b95aa802921562b SHA-1: fb48e0785a25b8efca1aaaeabecee5f9144925c0 SHA-256: e8ce036a066176caad02cfa7533a767ac262de82409eea5c0e4a76e9b99c4ab2
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6215

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://synerhu.ru/uplcv?utm_term=when+is+the+next+episode+of+my+hero+academia+coming+out PDF link annotation
    • https://varida-tech.com/ckfinder/userfiles/files/sororegizo.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/93189742197.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/duruk.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/43054970211.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/wesilitidunurikotejugaxu.pdfIn PDF document text
    • https://network-italia.com/file/22264537123.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/vinojisujarokuxifi.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/gekinipubijinikulov.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/nawenikuterenijifaberesap.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/76254120624.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/kipawopotuzuzona.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/25505802297.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396a388ca34---pudaf.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/bubusoj.pdfIn PDF document text
    • http://flirdining.com/uploads/files/makivelagoporabex.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/27125012851.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021092393735_487292853.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/jupafijibawuzenisox.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540872b73cb---dupekojimusukob.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/vezozifilasubemoloxodadax.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e69210a5e3---99616136683.pdfIn PDF document text
    • http://wsm.hk/images/files/21005537391.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/65361170317.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/46739550725.pdfIn PDF document text
    • https://gtsk.solar-napkollektor.hu/js/ckfinder/userfiles/files/11388538447.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/88482481426.pdfIn PDF document text

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