Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62182dbcde9a95b…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 00:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abe5095eaf56f32d015d3d0fe0c0dc90 SHA-1: 20eb694c1ead4bbb26e8ced14661386fd976dbb6 SHA-256: b62182dbcde9a95b12e28120d72c22ee4588aef1881828c16a717a44ad5a45b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=correction+lens+for+astigmatism
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609461e4cd083---64167115415.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9b8d6048---30934704555.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/98242336452.pdf
    • http://instant-image.net/UserFiles/Site/File/zebasuseg.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/75cc05b28019eb0f1aad8f812bdc9cb8/zedusagosedoj.pdf
    • http://hzqzg.com/d/files/1803998280.pdf
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99966476999.pdf
    • http://arredamentoambienti.it/img/file/83229142331.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4c933f36f---luwijisonag.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4386c469---22275737780.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/7481877620.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e6a9a8fe9---tavolodefakoxe.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c230f02a0a7---gutolemijikuwekuralimu.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/14c9ab3e29f95c674ed34b008270c131/16639580950.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/xevarilifawijezek.pdf
    • https://avonsteel.com/UserFiles/file/zevirobiginewiwufijomaka.pdf
    • http://onnetsolution.in/userfiles/file/94263277361.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/b33387bd09ad56921c28f144b667477b/satowifefuxufudinoxewokum.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210617204807.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d41d328bd---vorekonukokokuwutupe.pdf
    • https://aduanaldelvalle.mx/userfiles/file/xojad.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/aa7l732q89jn421caf56du1eu4/23920193973.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 16792 bytes
font_01_sfnt_off00010686.bin
39ebfb3d061a3d1ebbc2caceba6fac4f050b75d7487ab0f77c631bf64cb73633
pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 17112 bytes
font_02_sfnt_off0001337f.bin
66497f1a2966e989618af9358c470135b98d2fa7bef6a32afe080471039fb2a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1337F 10712 bytes