Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b759a9ada89093…

MALICIOUS

PDF

90.9 KB Created: 2021-06-25 02:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 82d38efb6cdf7c7bfb0171112ff4f357 SHA-1: dc839d1e101f66bf63334d66a4c315968709cae0 SHA-256: d6b759a9ada890930c684ac0aeebf8ae89b39c1da3c491db983747bc21e65811
176 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. 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 0.9996

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=ghd+tv+channel PDF link annotation
    • http://windowsplusllc.com/ckfinder/userfiles/files/4843306164.pdfIn PDF document text
    • http://ashioke.com/images/library/File/vupoxebavegidipukiduza.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd279542100---majijewamojazipawuvodiwo.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/76624179407.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/zasepidajezaso.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pmo9no089g78nq1l2trltt7t4c/53008121069.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/89257481966.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f5e29246a4823b8b515ea8c7d1483493/97365670437.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a9b36d94186a7b7e655baa17b7439e96/ditazatejugomagufu.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/wubugisob.pdfIn PDF document text
    • https://33mobility.net/uploads/files/5034923572.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/57962885086.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/82824c6d935234cb01e2e05705e665b5/22694520488.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/1498853372.pdfPDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/t8838di1ugd8bfple8a18gi8di/90036192323.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cbe483ac---31527943077.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210524192113.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cc9261944---79410866786.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 4844 bytes
SHA-256: ecd177c8177274aab1f49b1111a557e127b4b6673046659c26120754b87e11bb
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 2896 bytes
SHA-256: 029d1da3dba2e289a143c048cbe1c7c36599a0dfb9e8565cf305c4ec427168a2
font_02_sfnt_off00012205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 11308 bytes
SHA-256: 6641abc10a37f1c496685fa9b1b09b20ce8eafd578966676f2d84cea804b3981
font_03_sfnt_off000148cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CC 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443