Malicious PDF — malware analysis report

Static analysis result for SHA-256 74edef7ae4407e27…

MALICIOUS

PDF

111.3 KB Created: 2021-07-06 21:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c3a624b97d48a9fcf139b37c9f7c0391 SHA-1: bd1a11b9c62de29f240f3dd74a50960a3dc1556f SHA-256: 74edef7ae4407e2770de582460844efc766f6ddf35989097a4839e0cef4078c2
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/67354648583.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1okab4blu6jits8vthls35tj10/71745238404.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e991e22e---mazira.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/fitege.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/97735738130.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/134ae79da292b745034c110eca3cec36/wororulafinibavu.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/81f84128bcf678ba6eb887f736fdf873/75433480233.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/40239579074.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/73fa37a2b1c8f389d7ec8377f281327e/jaguxi.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4242d01f74597e4080d983267543583a/26123640589.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/sijazexojegisis.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/75178244782.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/godajasosaniteje.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/roxodavivejilowusosose.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4635ee666b---rilekokopad.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/074d68880a869f56bee2d7e09e12054e/zikakemijedepuwajuzagexun.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a87f009d0---tobaxidufogifizozelupo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b5d850d2---25718735619.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/12993258796.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d8d515b4c94179801ad33c634d8aa065/98759296590.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/122625cc6669d3ca958ac71be686e32f/xokufigax.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a2728b8c---62784935009.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/11929997142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=electronegativity+of+c+and+nPDF 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_off00014d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D28 18608 bytes
SHA-256: 0b528436900442109112d33fa5df20010ba6b3a145d6f0da15af6c4e5ea37622
font_01_sfnt_off00017e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19633 10644 bytes
SHA-256: 822d0008baa50a31c2fbb4cb411c8123410fbc4c12b68d89dcbf31e38958a464

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