Malicious PDF — malware analysis report

Static analysis result for SHA-256 8941840a31bd8031…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 19:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02df538d62266b1016f05e97549dc213 SHA-1: 9b27ea9d4e2da57fe54c9ac2a8d1c94d7d7da425 SHA-256: 8941840a31bd80315946f00cee384c32560bafa0c01f83204ed3aafd7a3fc8ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting. These links likely serve to redirect users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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://geluidsadviesnederland.nl/ckfinder/userfiles/files/rerarepigudome.pdf In PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/rotik.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/36701401358.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/jizujomefivipasumakinefi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d03bb93e---safunirevino.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/49307803715.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kavipidoxizerobewodumi.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe03759d0---20916419949.pdfIn PDF document text
    • http://benly-carson.com/product/files/rifeb.pdfIn PDF document text
    • http://rayer.cn/d/files/kogotomazemivogotul.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/hvo0cttf0i71rtkivv3amg769e/wutosemeraw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/odubngmgaigqspa00be5sstbkg/fawifeletunake.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cb54cbd6---16084188177.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ee07ed4d937---9868354825.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/94191695371.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0b552178---74376873983.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/ravevitagomejofupuz.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xovonavesezepixalut.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/jukew.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834e8595d43---32664363290.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/kezerapute.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o2mhdmvqq2tplm5u4oleg1p1dq/dofepagamabi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e30710ba4---99356030965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=electromagnetics+with+applications+kraus+pdf+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eb0eed353---tasase.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_off0000c813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC813 16400 bytes
SHA-256: e59d655b4b00ffe71125b0a619012d5fe0d143cc4b9d0404d9c111e7542c0e72
font_01_sfnt_off0000f281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 11328 bytes
SHA-256: 348bc8d477909371e22a3b343c82f80bb362e4422dea9795415c1afe3b9bfe6d
font_02_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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