Malicious PDF — malware analysis report

Static analysis result for SHA-256 341af6f5963b7c41…

MALICIOUS

PDF

92.4 KB Created: 2021-07-17 02:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 741fccb5589c09d707325626996818c3 SHA-1: 54053cbe6529952f7e1558876e403cacca9fca30 SHA-256: 341af6f5963b7c41e2b7d2b9e07ecdfa1ed427c72445cd2c82cb5edcf87df595
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The PRC/3D content heuristic also indicates potential for exploitation or obfuscation within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c08579cc7bf---42130741516.pdf In PDF document text
    • http://yonseri.org/userfiles/files/46368275567.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fa3490fc372d9b7ffa8ca8e12648163b/dukununiv.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/4601157073.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/jabeleradez.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/22692289421.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/nolavuwolosazedikoluvisas.pdfIn PDF document text
    • https://angkalaris.com/contents//files/5098216058.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rhjtmrf6fdkl81pd0ev1f177s7/48170947763.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55cda0b373---kodakumawe.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/fujesibenivi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30d006c14---zupojivezum.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/zifumijavaguw.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160834d38735e8---73999169879.pdfIn PDF document text
    • https://tepihtrava.rs//files/lowunexepejevinod.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/dupinadipenikivadavokodav.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/38323106397.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/41077500512.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/dobonu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/zimidurinab.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/88949661404.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160952caf1392b---gezigovad.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/71923653200.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/tomisewif.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ecc790ca6---memibajepanilovunirobo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3fhq8j6mcjn44nagi7b1p6kc34/divovesikalidilulos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=large+letter+prices+2020PDF link annotation
    • 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_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 10524 bytes
SHA-256: 512ff035271cc0c71a0c44ccbaa212db5a694355aa5cdd9c1f6870d80914471b
font_02_sfnt_off000135ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EF 17724 bytes
SHA-256: 1f37a5fcd0327bcb6562e54e86fe187fe8435fc7af9ac1012ddeb9197ba37cf1

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