Malicious PDF — malware analysis report

Static analysis result for SHA-256 4642415f227ec6a9…

MALICIOUS

PDF

63.8 KB Created: 2021-09-11 18:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c795a7e1e8d36cdee3756e2a82b55a8b SHA-1: 02baed28b406e0901cf375bc66a69f78ab7fc340 SHA-256: 4642415f227ec6a9e650e33ee1acfd03f8f55139fa83c12c3db8f833e864831d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this PDF acts as a lure to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5435

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/36311382994.pdf In PDF document text
    • https://dalba.net/other_files/File/linoxovam.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8e460b5b001ad5eeb5fc697249f1f98e/jakimasuwefewiwovebun.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e6268c4163f9fac7c51183173ab1db0a/25656230489.pdfIn PDF document text
    • https://penzion-palice.cz/content/belidiwiwukulufof.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/disakasakoduge.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wawidivuresedixatafagumuf.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/gajerasok.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/bubim.pdfIn PDF document text
    • http://iscelenie.info/files/file/rololonevopesazus.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/48767540840.pdfIn PDF document text
    • https://kopari.hu/files/file/bivikujizoreguv.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9f382f879---55375337854.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/12768795993.pdfIn PDF document text
    • http://cochemical.com/upload/files/jidedufonumubog.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/79524186796.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/92621459180.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/97732376089.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nofisobofa.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/raminolume.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/feviruluwowabidukeli.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/61877574001.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/tugumu.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/papawebiwijatowijevale.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/jamavopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wlan+passwort+sichern+androidPDF link annotation

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