Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a768c63f4cfe74a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 07:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 95df1cd970af38c181e0346b4554ffcf SHA-1: 0315d6c713bf64c9e4dd4a51b7c0f0b249a8998c SHA-256: 4a768c63f4cfe74ac5bdaced198ab4594df9b25c0c115d96d2457141edf1e18d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of PRC/3D content and external URI firings further support its malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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
  • 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://drafthe.ru/uplcv?utm_term=spdf+valence+shells PDF link annotation
    • http://busankid.com/webfiles/board/file///19853084302.pdfIn PDF document text
    • http://chinahongji.com/d/files/kivenoputunarisosaxa.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce2b786f25---ravoloxuvoso.pdfIn PDF document text
    • http://waterreducer.cn/d/files/47738583462.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/89831611161.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/26728222106.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/gexawaxaxulibexunal.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53387130537.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/87281448400.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16107b4238ab1c---rinisosite.pdfIn PDF document text
    • http://theettiaresottawa.ca/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/zepazujixidajetoralujez.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9afbe2dd7---2325958549.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161251e14c0ed8---24383535510.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d0c0cd678---dinexipixomuvibub.pdfIn PDF document text
    • https://sy-tech.eu/file/86591902933.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/1865084773.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ssjbl9blf8qij832ugarohvpd0/vapidureza.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/945ecc6032db0bbfa15f71b1656a07d4/36502500959.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/rupoxukapamoruxap.pdfIn PDF document text
    • https://taperagi.com/contents/files/pogitazemogopid.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d1c9c16d---dunivuzilij.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/gopuvajotakomex.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/70815947628.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acfc62c3e93---53829822112.pdfIn PDF document text
    • http://jp-cable.com/d/files/89612882842.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/simaxigasapopeto.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/93546207373.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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 16336 bytes
SHA-256: fc4d33373d5b058990bf822772ba850b17cb22eee169ec1263b659dd0fe8b78b
font_01_sfnt_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12059 10448 bytes
SHA-256: 4972da550796646bda100a68f0d716bc29c2884d914bb1e5287af2ad0dd90cc4

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