Malicious PDF — malware analysis report

Static analysis result for SHA-256 731bd63b6d2017ef…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 10:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 271b881e2348d11c64f427414d986a67 SHA-1: bfa0bbd08964d1bd5ca2cc08d8eb1c3afe11400c SHA-256: 731bd63b6d2017ef559685114c1a8ac02bc0d9f7daa4d67c2b0da3a355fab7af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, including one identified as a compromised WordPress upload, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=impossible+quiz+71 PDF link annotation
    • https://noriupapildu.lt/ckfinder/userfiles/files/25743884303.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/89663460644.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/17193267084.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/tofabozesexesetoxijemuvum.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/66175252331.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/98131764189.pdfIn PDF document text
    • http://nemochem.cn/upload/files/gujovefutebipatel.pdfIn PDF document text
    • http://ccsl.asia/files/pasowed.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613889c1198e9---galumizasunizuwaw.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/87875990231.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pefima.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ecf20tt0pq53lbgojek0cln945/17273808943.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9bbd20fc---pomup.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/jozipumez.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/7524330756.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109111854114098.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/nabusunajotoxotese.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/nuripokalud.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/47c1b26537d24d46349330a114cee80d/tubawewugugebi.pdfIn PDF document text
    • https://theipbuzz.com/images/file/ruzajibijawipesevo.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/4270890339.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/ziledomowivedepugoloxu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 10448 bytes
SHA-256: b181dd03b9cd1717e5822014c10f5ad25198eb7c7f10470d996eba850b2bdda1
font_02_sfnt_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 18428 bytes
SHA-256: c8bdea4cc32de5d893dbd30a6a7cbc4d2b1cda49b75efca3430511ad88f8b919

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