Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2a3fec228287bb…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 14:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 265c6755214daa774a57d1ef14bcbf69 SHA-1: 2afd76ca27f69e4910a33655e50a987ce2049c1a SHA-256: 5d2a3fec228287bb56aca41803e17fb2f3f55ff8b011b8299dc9d8fdb3bf06b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.tiendadelbordado.com/ckfinder/userfiles/files/88898243379.pdf In PDF document text
    • http://inteko-tula.ru/f/file/remerajesizoxexuw.pdfIn PDF document text
    • http://onelove.cz/file/wupalibodemoso.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/xabowusodem.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/kapaxin.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614525b4d5168---3743356335.pdfIn PDF document text
    • https://temahr.hr/files/43506802256.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/29718670697.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7cc1628933f77899c868b57996a501a2/48282760555.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/93489332505.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/tonakowexevalamanedij.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161312fe7494c8---sapenap.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/85260090426.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/91475109050.pdfIn PDF document text
    • http://machulski.com/public/file/pexew.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/26199566269.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/kimonufuwimefutatuv.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/14754155820.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ced3c9894---95132018970.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9m4et6spmn74gppl3v3orbq1eq/nikaligiralaxowalokuz.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161419b00b4bf0---bofowatolupu.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gukoxuxow.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/kolaxujagoxoxip.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613842b2ec663---66716998771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=androdumpper+wifi+hacker+for+pcPDF 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_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 18176 bytes
SHA-256: 4983f2bcb7a689cac16ede5dfe66f5d12345ac061d41bc3fe873a0b11d3f984b
font_01_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 10832 bytes
SHA-256: 86287a88007556440de9b1c893ba42654e9ad4093b7d99845a8b83f65b58646b