Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef612585055d08cd…

MALICIOUS

PDF

172.5 KB Created: 2021-06-13 23:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 88fd721ccf5e93dd895636d36d86d1bb SHA-1: 4949cd76433595e82392199b620b9ba8cf74178a SHA-256: ef612585055d08cd7e946178945a2117797bba89d19b0eb8c95e710d68401a3e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9969

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=jurassic+world+fallen+kingdom+zach+king PDF link annotation
    • https://addsfly.com/userfiles/file/98292738571.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b860de5a---fesafuzilobakulemo.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ce826062---49062140900.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/60484658801.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2ff7f5af1333288621b3360379f0254/94332798009.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8379fe4c356a150f6d0a06eb5f2ad26a/bapofupuv.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/36765659540.pdfIn PDF document text
    • http://talleresjpg.es/img/file/zaxipimi.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/63124911328.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xodaz.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/44385821595.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6f3e2de1c7e0e50136f939f9ad005f35/kotobojaxovezatopigapupuj.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/63798689540.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29a5fb8238---97665038729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C13 5432 bytes
SHA-256: a71db1437f481a31dc91ba72cb56bbc18a48fd69ef32c243197b7cb89b0c769c
font_01_sfnt_off00025e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E5F 1820 bytes
SHA-256: 32c9735be5e9b7b13cbe74779b6ea8ad6216d713a4d7d56ecf1e0de8bf6a962e
font_02_sfnt_off00026713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26713 13908 bytes
SHA-256: d471447e552e8884a20d04090caeea8f5e474e971225dcb44ab57c892877fc6b
font_03_sfnt_off00029417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29417 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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