Malicious PDF — malware analysis report

Static analysis result for SHA-256 508897c6e748bb05…

MALICIOUS

PDF

64.0 KB Created: 2021-09-16 09:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a4e53822f3734ba6c3e142db0073c6e SHA-1: 89c6ee5f1235dc8dc69989686bd71f765534a956 SHA-256: 508897c6e748bb059edbfc724e27d770681aab61fad572ab6a90e34b0b00fc2d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript is likely used to facilitate the malicious activity, such as redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9203

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://hung168.tw/UserFiles/files/32898845778.pdf In PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/mivorivimom.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/wegegasidoz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a175b9f9ef---xiborikigujapog.pdfIn PDF document text
    • http://njxinbell.com/upload/files/81224521541.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/33035682536.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142b5c8db064---mogidom.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/59054395729.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f716a20083---xidibebajufox.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210916125634.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210907220942.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/pebefelikivilemupab.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/tikopijujodi.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/29921562546.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/50286952691.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/60921147082.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/rotimepovojofijuzurifasu.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/weroxumorozutumemojidobi.pdfIn PDF document text
    • https://steammining.com/userfiles/file/1006492798.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/buveruz.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/91302205882.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210907051459.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/47409103816.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/jifirimarikixikunegiz.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/fewitivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=which+one+is+best+android+or+iosPDF link annotation
    • 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_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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