Malicious PDF — malware analysis report

Static analysis result for SHA-256 5740fce9f8d62921…

MALICIOUS

PDF

121.7 KB Created: 2021-06-27 12:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3bfdc792e4ebfda43e194fcc5d7f3f2d SHA-1: c0383b67929cef4520b8a6e1b65b31ee66faa1c1 SHA-256: 5740fce9f8d62921d23070e43854ef2dcbde4c4d4c00a74c16be1c18d4a0cb92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ce24f04f7---rageweto.pdf In PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0cd50888528ed89ee73a946e9aaa7b65/26640448888.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f0b695eb---zilolewalilizuwa.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/597c4fe7bc09274c1642e89d89214db2/55436597502.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b70f5799cc25894f2f10c6edf99747af/96699988901.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/69b8ed3a021ce4ec72df6e2d1227b30c/badik.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/bavabusa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7d947f1a0d6ae07b31314a278aa401ac/6793515973.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094e0185ebaa---47851635943.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fb714451c3e27434540855e34fe4f122/kafefufudakawitizuno.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-11/20210611184311533931.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/e79482cba1bc8a31cc74c0e6053f9eef/38377923839.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607541ae0db0b---61631461761.pdfIn PDF document text
    • https://siroyensao.com/upload/files/26772632136.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0d5761e847---lupazununa.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/durivamajuba.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/57362056319.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/25716712209.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8219098c---48835212302.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2be64facc4614ade1fd01ede1cffd976/zawefizulinowevasuvuwo.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/22e1eaa039398acf3917d9e7596a8c5e/28825683324.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3d86ff2d047bf2e6e4decad937a81618/77280473744.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be04159e25---vixezevizegesirubaga.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/30873354591.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609448fc32019---mutifawugus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=wow+blue+postPDF 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_off00017ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ED8 10108 bytes
SHA-256: e1c866983884be80991c6fc60b6852e8bb9c2dc07df2e5ea18fc2ee78e307bf8
font_01_sfnt_off00019565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19565 16968 bytes
SHA-256: 530a734e4635de6e9e51449bec2e4a3bebc8fbb376c74863e2f87e70d5ce3502
font_02_sfnt_off0001c1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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