Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc23d2b179219d93…

MALICIOUS

PDF

97.4 KB Created: 2021-06-29 07:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bb936270230af5c7b8f4acfe0ed9d0bb SHA-1: 8a820939d89ae6893be9d345712e12d444051ea1 SHA-256: bc23d2b179219d933255855e82a3c40293bc07c9ea5c89354b44565d7ac3787b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories or disposable hosting, indicating it functions as a link farm. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the nature of the links suggests the PDF is intended to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://camionespanamericana.com/userfiles/file/86499027451.pdf In PDF document text
    • http://www.armstrongre.com/files/files/59225627960.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a368fe5bbbfd6d951cb8fc6f6c37235a/93813899851.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/uq9u74gb8c2i6hak9nvs7ev2s0/74435483521.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/49753575478.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607088fd40ab7---fivorifapiduzojabawep.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/eb6863d748b3fde7502cabddc8bd921f/30368109710.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dadb365743---zowemenutib.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8fa6ae522---pixedozawazobozof.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/rexakunupazugowobulozavaf.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/af17159f19de1907b9b7e883e91c6bed/28458044120.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d41d328bd---vorekonukokokuwutupe.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/pafiralonepipunukulip.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wurakazibekugozudebo.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/jtrtjih7gukf9gn4021u90vjin/3061593327.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/xutoxodufebiradizuboj.pdfIn PDF document text
    • http://wwstationery.com/files/file/zuketovewewurebezuwosi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d447b829e---bumowifukida.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072520e4aef8---5543264869.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608203f093b46---veneb.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e5m0jnhrl06narjjfnmqug7cj7/wewedivowaribesax.pdfIn PDF document text
    • http://safetypath.net/cms_images/wavapolowijonerebazaxiv.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/937ad69047d0329ff78079cee3fb9fdb/lipugirojelebaf.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/vinepinibi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/82950431668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=guinea+fowl+and+chicken+crossbreedPDF 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_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 10932 bytes
SHA-256: d3651c6594c40e8bb3691b955bf0e7899038b38b06040c95e38f4a39a2e26479
font_01_sfnt_off0001339c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAE 17100 bytes
SHA-256: 87c215219ba1a618dc7be6e6513ec6e946adcbd3eae87511eb4450e41c491058