Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2aba306b9aa3dcc…

MALICIOUS

PDF

89.5 KB Created: 2021-08-04 23:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 763aca07a1c02ad24da38c10045c86a8 SHA-1: 1398393f82ab4f41aa7fa744368996132aad75ab SHA-256: c2aba306b9aa3dccde8d8475f9d60d471e59fdc34ccda836add126d0b4b74bd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69b90656631f4fe70c9f9a6615a0435e/sakufijiwewaxabukowebuse.pdf In PDF document text
    • https://betenrealestate.com/sites/default/files/file/zopota.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/taqj2crdpn76td8lhe5uretnt7/6345205404.pdfIn PDF document text
    • http://budka39.ru/files/noxodewazepudowe.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c704ba9add8---fotewo.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2bbde335e8160503cdc6b7aa3195301d/konejowezil.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/vazuseda.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/dasevaka.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e997f2176---nizimupux.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607eddcda9191---39977473649.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/83853677760.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609646bdb30d9---guvejatotixefobobik.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd6b4e802d---59711554769.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/mebiposu.pdfIn PDF document text
    • http://ekotronic.eu/files/file/66205646097.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/03b8c121614db767f16f2e62ec7fc31d/74353959469.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/72460504274.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/xigexoxujezafo.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/84719282671.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e323117581c---95686868475.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/996b4d75514c1343e8281162b8a67c42/96643195935.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a725b0036c---damuwaxexonege.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160981fbb6bc9d---17016963934.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7cd2513bcce9675e5853ad4747e2e914/93571390914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=battlefield+bad+company+2+gamepad+patchPDF 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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 11228 bytes
SHA-256: e3ca7b09d964d3f24dfe6fa0c35b9dc812e30f95428e6df5d00c7e5d11f258f3
font_01_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 18924 bytes
SHA-256: df90c21082775f9018d9bbba6c8ac4e10ac5b3322fa3c3476a08faf4d86b0334
font_02_sfnt_off00013ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1