Malicious PDF — malware analysis report

Static analysis result for SHA-256 a163562d290d1bbc…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 03:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e94044ba4425d533573d0fb4fec987d SHA-1: 0811164502662732e19e624b12d19e818c99e695 SHA-256: a163562d290d1bbc5712ab8d622088afd3c6e70e802b1602e75d878f1ec2d502
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URIs, many hosted on compromised or disposable domains, indicate a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ketchas.ru/uplcv?utm_term=death+on+the+circuit+pdf PDF link annotation
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/gerudiz.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/51219288751.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/jopexuz.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/gefabekejudijevuwag.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/58234513746.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/66454566188.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/67937515633.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/12686240827.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b8a26fb120b6a050ae13feb9c4846773/19063526296.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/85137233060.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2d3c194e8c8f2154a564325d45ef46dc/8846922039.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/38641380130.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xokejatomaj.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/jimutasadupuvodazex.pdfIn PDF document text
    • http://dongphat.net/upload/files/69154814549.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/69352261248.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/gozepugibewejefavaben.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/45302298318.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/38134098511.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/lalozawidowiwaketat.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/59989462669.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/fssqcpj9bnqsqfc46mg3ii4r58/romajomez.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136178876f6a---pixovosik.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/11638597116.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB0 10604 bytes
SHA-256: 4a9e49440732960add887c440ff08dce4be2d973b49fd9f584520f9b73b44899
font_01_sfnt_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 16440 bytes
SHA-256: f05cf4de65fd7d86586af28653a9754529b5c8688033031f6d4bf0a1d1817908
font_02_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 18536 bytes
SHA-256: 168be18bb4adfa8fa2e1d5d824498adbf1e9b4a1f2f2e0861895aa46eb7cd6e6
font_03_sfnt_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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