Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f53c35984154b0a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 13:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c440d4eb9b3e7af5506b1bcfb27d9292 SHA-1: 892a041f855595b714ea171edb9715ab23ff6734 SHA-256: 4f53c35984154b0a43394de0e96c41be0e77f485a7d4718aca67427d3142db5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://protectname.xyz/whoisprivacy/userfiles/files/73520251438.pdf In PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/93234506612.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/29801834665.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160daa76fddecd---zanasixe.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb5550d3e---xajuvemajutuguzix.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/79850707280.pdfIn PDF document text
    • http://fitviewer.biz/files/file/tesakarifetiginevopusopa.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/33526173310.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d22e5459a---13938898429.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8b3816d5a49781342e037d572f1a6fb9/64209898470.pdfIn PDF document text
    • https://vestol.bg/files/file/46598391800.pdfIn PDF document text
    • http://hk-keber.de/images/file/54489827011.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d38a2e01731af3103bef69702cdd45d/mijawubesinome.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160761f0139927---54208314730.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/29812524589.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/10160074431.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/47073097660.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd69e9b01---zavavidatidagemag.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/66330507856.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/kokor.pdfIn PDF document text
    • http://halanmilk.com/upload/files/zepilomumufigilidevota.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/dadixaduva.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/69212267469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=five+love+languages+for+singles+pdfPDF 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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 10716 bytes
SHA-256: e11f1e2b4af95bdafab25b6583baf0009d7d89e0c8fa07302eb9c8e93f1badec
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 19484 bytes
SHA-256: a993536dc5271d3d4af564acac676bd42940f7b94850b618952135ad9b1fab37
font_02_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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