Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0bbd7c5ef5668c…

MALICIOUS

PDF

110.5 KB Created: 2021-06-18 11:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: aa1cc638de76bba4036237fb91981536 SHA-1: aa34cde49374c19b9fea538c927909e420daa87d SHA-256: eb0bbd7c5ef5668c36c2866dbe258d864f845f819f2151e5082c71e81fbb24cc
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains heuristics indicating it is a link farm and uses social engineering lures, specifically a 'Browser Install Lure' and a 'Download Button', to trick users into downloading malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to contain junk data, but the presence of multiple links to compromised CMS upload directories and disposable hosting suggests an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ac1f3f23---25207401986.pdf In PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc57fe201c---43546414576.pdfIn PDF document text
    • http://motelandratecuci.ro/userfiles/file/tojawokumofajize.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a555af8d360---33789797385.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b0165380ae1dbdae904a44eceb9feb56/26922065291.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a85edb49efcfeba102287c19286e7785/8587938789.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/58c830c6529519ff702720f49b22e5a0/noxanijepavex.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ba7cs3oj7d9bjec5i6cc0n6fvm/85189828086.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4735fbf90063f215e762d8b3d98c40fd/18883281236.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/71241c3297bd5349138a5ac213696698/26266670603.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/19033776372.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/teviwetalerawisize.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99f95d6db---fozomovowabalul.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b46fede4f9b---51272178533.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607359fe0430f---37480766417.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/sapovimububada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=trey+songz+tremaine+zipPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018440.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18440 23160 bytes
SHA-256: 276f217403776af81a45b58a60caed318f7f497a840b13e470aefaf15d17a16b
font_00_sfnt_off0001380f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380F 3740 bytes
SHA-256: 0aac686a06db60d8810a9b212503c58be430766071c4776ffd29001ccaf394c0
font_01_sfnt_off00014546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14546 5208 bytes
SHA-256: 3cf7d5d441510b833f806f2ad306ce09c600de02bd9e9ef14760b0346456ca6d
font_02_sfnt_off000156fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156FB 14540 bytes
SHA-256: 8d874ec45e5f91f18eeaab57b34ba1841c173cf110d0c8abacd30e003b9d6e2e

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