Malicious PDF — malware analysis report

Static analysis result for SHA-256 876f13eec6b39b42…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 00:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a408cc72be62c1b3720562113950c7c SHA-1: fe8efc9b163ac37c43b5ccd1a07ba30ab1b4edcd SHA-256: 876f13eec6b39b425c226036c604dc15d729e91643777c7631217a3561081ca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://camgloberealtor.com/userfiles/file/21633416035.pdf In PDF document text
    • http://pensionpoint.cz/userfiles/files/43074061340.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/xogijotilifova.pdfIn PDF document text
    • http://gloria-eurex.com/xorajunok.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rgmj7et8d5hfp7ciqmdpb5m9h5/91196661499.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6e20ab92---xakotorifovox.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/sumatatufa.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/50cd9a285b314b65441efed8e2bbeaa1/26210658510.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fjm3l88438tfq1bes2mtnhf02/13266011270.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c5735577a2cf092890d70b4cd780bb8/20213047168.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/59749780138.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/7569557800.pdfIn PDF document text
    • http://synowka.pl/galeria/file/gawewefodadutezakenodozu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/60075544271.pdfIn PDF document text
    • https://linardi.ru/files/file/83882137717.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/segejuvapa.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/58714995256.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93df50dd2---wararetiniwiroropotusu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a0b88913c---kisajatawawe.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/saxejokikixe.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/876eucgk6e8k9f4r3vskbdbs24/62697836537.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/on6fme4qkvhitl6qllgpj4saqp/88308699789.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e55b2772---74618886809.pdfIn PDF document text
    • https://123natura.com/stockages/files/19110407338.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab28baddd7---zaxufi.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/bedenoxodofizinoxolidago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lg+32lv300c+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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 10256 bytes
SHA-256: 36946db3873d5953394415a3b17992c1194577542f9acc5d7521fd699bca1282
font_02_sfnt_off00010fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB1 17468 bytes
SHA-256: 8a53070c48692a7d858dfe4acd09e5acab7979c29daa13327c4dd9a92db39914

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