Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab4dc08423c0878…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 10:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b922075201f45275f0afad4e22e88ee3 SHA-1: cca97482533e866cd2cb191ac52849cbe0595928 SHA-256: 3ab4dc08423c0878d4d4db9c9be1b62ce2e2c580316555b7dfce2c0d2247ffe0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document is part of a link farm pointing to compromised hosting, likely to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sunsoftinfoway.net/ckfinder/userfiles/files/lagepubo.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/233ffcbab1d4cdcdf2a46de9c3b0f62c/jetosiluvinitifabefisimu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/4917492da2f0014038c9be0a3d2a20d2/98355853214.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/3670814491.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b370c73f3f---98014249034.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc41044f69---93322466149.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/11499557870.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071a576d4fb0---31890125234.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607de25693cc2---tekafowusovidufomejekok.pdfIn PDF document text
    • http://zivotzaokny.eu/res/file/juwewikorofipejeru.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/wutipibetizisogolu.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/284468815.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xanagajiximejezuzinid.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b532fda0---jizubugilexuveguwuwujejo.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xobawolodutiwaleladup.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd2db4951---64135736102.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/33518544967.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/vipejoperuvezuberoma.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/fonulasotonosaxuxuvekuw.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff78f0e53---60434333063.pdfIn PDF document text
    • https://rotitelor.com/contents/files/28648588259.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/51858684884.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wadixokulonefewinukaben.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/funudidajuzawagewesiduxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=core+data+by+tutorials+pdf+downloadPDF 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_off0000d23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23A 16728 bytes
SHA-256: 280a205fde9dd93120f21400fd062da1a48390dac2e0f52d937a70d91aed7bb8
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 10960 bytes
SHA-256: 728845ada21beafbbb1fa1ae50fef5399ee5a9419e1de25a15c77c97934d6c7f
font_02_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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