Malicious PDF — malware analysis report

Static analysis result for SHA-256 731ef96ae16b7ccc…

MALICIOUS

PDF

76.7 KB Created: 2021-06-13 06:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c9c05ead8e53df1ec1b80bfb91403eee SHA-1: 968dfd433c32451602ce04e281140430e13fbdfa SHA-256: 731ef96ae16b7ccc275a4843f3f9bb80500d62021a3408264f64b0d98bfee588
156 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 0.9998

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://garglob.ru/uplcv?utm_term=my+love+from+the+star+tagalog+episode+1 PDF link annotation
    • http://africanhairbraidingsalon.com/userfiles/file/fuzokefotena.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b31bd694057d0fbf18b12e7e8ab7d247/17340602093.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e60f8e6e07961dc33eeb87d01784ece1/56199799069.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/tutewotojonuponosapig.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd621b7eba8---23415654796.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/b977bbe9997bd1882aead4365c7d35a9/bokuvaxoxidabud.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a1033f87f332998da7974d65d0966261/suvunejunonakefi.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kirulixafozazoxodet.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/92909718441.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/68952144491.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a50abf45034---vunubiwuvokuzaguwusapego.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8b72638e25f739e0bc3b63738d69761b/tevana.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bb388a0ed9856c2a0be25d4588dbd030/zububujuzonufezafigavo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c02a866a9---jemudefekugowedipeg.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/odhqkan4p04f0j0ctjc7aatdp1/powunedumoxejawo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 3616 bytes
SHA-256: f2591090c1f5c983c9f1139b4599ddf7fc795eb60b21772a6d7b01c112059430
font_01_sfnt_off0000ed63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 5672 bytes
SHA-256: f40ec6dcb53580704be2b53cf5ff3c86ef7c8195f1d60ff42860065fc0f86323
font_02_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 10656 bytes
SHA-256: 73cc826473af9fc38ace4f3b16079d1002e9c166d4e3bd6ee18c7522a3718429