Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d572f57e0ba43b6…

MALICIOUS

PDF

62.3 KB Created: 2021-09-17 18:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f273a4cb564a3cef5a302fe769aaa7bc SHA-1: 53202412c8b7ee7c1bd24839bd09183c672c592f SHA-256: 9d572f57e0ba43b6b572a82bcbea7ec5ff706233cb23930e3c5ab5ff61fd4afa
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9284

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
  • 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://catamma.ru/uplcv?utm_term=ftp+client+android+studio PDF link annotation
    • http://chongthamphucthang.com/images/news/files/zimimutemukexujegasevu.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/vikik.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xuwunikepewirafe.pdfIn PDF document text
    • https://led7.ru/file/samavul.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nuzakakenutawelare.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091705192273499.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/16797540747.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/17023194547.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/balubinateloguledisem.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130253222c06---gumamafazixuzeg.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/nedurobisodog.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/84785266462.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/19431365980.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/kowuvolesubunokinetabipem.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/27522343390.pdfIn PDF document text
    • http://immopolignano.lu/images/62592457335.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd054a19b3---widarenefadud.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/72293672484.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/48259936722.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9e58d0fa---dawimozizisedofozujijan.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/bikagemaramur.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/wusisovimav.pdfIn PDF document text
    • https://novsport.com/content/File/xabojegirejineru.pdfIn PDF document text
    • https://matratva.in/userfiles/file/55841271700.pdfIn PDF document text
    • http://aminotp.com/upload/files/50272220017.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 18536 bytes
SHA-256: b66dac5fa2a4d29d3e5ef0f1baaea8d90e29aa8b906c708b552b2d33d2257234

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