Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8421810d98fdc9b…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 12:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3a06b8e7069e75a445eef2d9e7df745 SHA-1: ae39fcf8c6216d7b0d892d9c87afa675e76533bc SHA-256: e8421810d98fdc9b052830d9939fdeb8590226ddd846dd7a94b20f907796a891
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The file's structure and embedded links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=bullet+journal+dot+grid+pdf PDF link annotation
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/kikole.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202181181167361.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/mbbqa0llqg0o2smek98fgq442u/watuwekisibo.pdfIn PDF document text
    • https://giustofiori.it/file/vesil.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/0e26885ebd59b8c6510f50af9a5b12ae/difebezagalaxisezigexi.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/23153708240.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/bafazawirazirepafifowobi.pdfIn PDF document text
    • https://bagstyle.uz/images/file/didut.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/57137275716.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/92215774078.pdfIn PDF document text
    • http://sivam.pl/files/file/bijufexoravalativap.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/90769523886.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7e924b723071fb02903cb0a3c89a008a/zozavosoximara.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/46746942017.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c36ed2ce6d87441b696e9b326b4c5991/20324377614.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0dad7049e---18763906873.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1f8f80e603a4bc8ad70a4771f254579b/67169284605.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/14c1456f1637427d10c9a0298bce8180/juluki.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/45622237140.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/nekawujigelebozojojati.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/90762422847.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607d39127a3bb---65064920252.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ueanl55ca0bmdbt0dbct48tp65/37617697761.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1ce22e14---75238975940.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/nebenivaxavupufuxuma.pdfIn PDF document text
    • 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_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 18488 bytes
SHA-256: f6ecd4dce9baead2cc5418a8689337f21181844be422b894cb9ab62ca14c5ccf
font_02_sfnt_off00013a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8C 10788 bytes
SHA-256: 01bbfe95c9bee1ca1baac6ad197bcbc3595b24d6f67b6214bdfb32143cd99e13

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