Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf46f0b3d9de1e30…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 17:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed83d53330449e236c540a1828951938 SHA-1: aa646e6124532156b5207e060ecf87540f81154f SHA-256: bf46f0b3d9de1e3028a92abce97f59fae2d8f4accdd54d8998d58f1968dda41f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The embedded URLs, such as https://coretry.ru/uplcv?utm_term=fake+card+number+and+expiration+date, are likely part of this distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=fake+card+number+and+expiration+date PDF link annotation
    • https://bandotrading.it/uploads/file/nanemedebenetigiv.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/33775103455.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31260680835.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/70177609411.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/53283340756.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/35874175981.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/77547667089.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/11011302326.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee39eb0477---73288791319.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3e686a8d---23890000257.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/wiwekewewi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e1d98d1e---79439571132.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/eg52h6b7ldhe6kujoaem422k72/zuwiketewuvelizevu.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nudapofesiraxukemeje.pdfIn PDF document text
    • http://tercovci.cz/files/file/zedorewugifamuzokoku.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/27526002745.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0372abc04---demifuzeterabenuzis.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/57060163243.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/nonenipetivuzutu.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/bagufibowuxupo.pdfIn PDF document text
    • https://mangallagn.com/images/file/95216666017.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/negagotazaxojuzini.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d82130e06c---wemarolikekijalubobize.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_off0000c55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55F 10872 bytes
SHA-256: caaeda51dfab77ab20e297b59b0cf888b72240decbbb5cf664b13ffee694f000
font_01_sfnt_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 18416 bytes
SHA-256: 774e6455d76fe97cfbbf30e4d481521774269610cca43500b3b6ad6c0f78d6b9
font_02_sfnt_off00010d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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