Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb11b634480c7c8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 04:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4fd2fc3c41fda02c40cba6d1bba1d457 SHA-1: a9d7a3fffd8a998262b05192ec1a5131258d658d SHA-256: 3cb11b634480c7c8bf0ec7940bbd321a8104911b6bf058585445ecf7ba6a020e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. This suggests the PDF is designed to lure users to these sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 http://birons.net/wp-content/plugins/super-forms/uploads/php/files/acdf8ae5511b58dde59441c803832c9b/finawanibojesijedabupin.pdf In PDF document text
    • http://hanart21.com/files/userfiles/file/wuwesuvefosuxijosaweku.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d90fbb9699---lopaxofodid.pdfIn PDF document text
    • https://hssanesteban.cl/files/rifam.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/38908151668.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab02c6d45e6---zomazaked.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4cc51377---pozexivukasexitepepabeta.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/07fffa99d108c85e0643c1a3cb46a1a3/75607607383.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202108211512271232.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/q8117032inrgs60afev1hs315j/rapewa.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/nigiwute.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/72643529781.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/14151220527.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/mdlkefqu76kjce38me2rq8se22/topenupotogurupuv.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/af7d198794de66811811967babeec334/vofetuwajupuvuworuvixu.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/41601431671.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/28690366739.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/41267818919.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727f5935b6c---pidarovuzoxexeganu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16112ba572f898---witepudejisasuretisuwimet.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/kerutefuwejaromejedumov.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090615520073499.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/3559400384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=can+notability+edit+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_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 18096 bytes
SHA-256: ed7b0bf40ea7c00aac9ef916b183aeff6d5ba0340e8632f2e0016c2aa4f75598
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10508 bytes
SHA-256: 97ae3369528f42d5215163669305880d10f009a503859e5601e9ae71fcab50f9
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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