Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03dcd51b9e9b532…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 21:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2530fc2a86706d4135c79949f994873a SHA-1: 6f7e0ad4384ad5f35d8ffb673e9979f2a2677182 SHA-256: c03dcd51b9e9b532a2a6555b1a1b492fd4accbb2c2525dd36d3a952ce43c6fef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://garglob.ru/uplcv?utm_term=environmental+chemistry+pdf+for+msc PDF link annotation
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa83c84232---2045191461.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/28618628531.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/vexunidopew.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/nifegisipudomonelikonodut.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/61575309120.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/robizasipozud.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/nukalurakaxiw.pdfIn PDF document text
    • https://tipresentoio.it/images/file/pexuloforunip.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/abe17e45457960ff3294e160bea21664/3532021868.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16104970dcb264---26028122575.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/vo8oe3oh04meoad6bs69tpp6mh/15243347222.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/wipodutibukukebuwawijub.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f1e95abb0---94977862280.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/toxabovivelexexeda.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad2176576e---99423947034.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/suwom.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac25ba3d972---jasuwaxaboxolotal.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496b557de2---42122452035.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/zixaroxolaxajamivowaku.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/50205816079.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/sopusajawugofavededozeno.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a82ee23e2---1417191278.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_off0000f872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF872 18288 bytes
SHA-256: 61651b0e4af441a730ee3b4146e5cfbda301de80d5232844e0c067de82dd2b03
font_01_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 11048 bytes
SHA-256: 574fd7f24644734c4f110c1bc441a30cd45210e6746c9bb95745e90f4141f460
font_02_sfnt_off0001418e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1418E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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