Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad89df3f9ec86027…

MALICIOUS

PDF

81.3 KB Created: 2021-06-18 19:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1442ebf68974d67e7c2a758813c66046 SHA-1: 5a7652ee9f29e1c8ed315de1f26173efd89277d2 SHA-256: ad89df3f9ec86027023bcea488f11afaa287447c32c2c8638d30eb4a51d7a3a1
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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/e10be2vvd58sggalj53ba8qu6d/1210103070.pdf In PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f40c03cdf6---rosolamer.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/648a6fbb898dfaf01857766ab98959c8/20594535202.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e90efce17e11d18e39dd1e9d3be662d1/49926565502.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1de8f1632---rinaxaliwiturojafub.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/7bedd4262ef5750ddc814c10c4370b37/8026817329.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec9ecb910---5472549397.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/5213628845.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4f91f786a3fd2925a8cf8f740d92b03e/45044766219.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b0581d2cc---92572216904.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/mafuwusonofijepevavifusom.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/kurodilapebewoxomasuxob.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16087156591226---21778088432.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/786a90e5012b50c52ca4dd2e535508d6/67939873255.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/191968f7052c3f67925adbadc995c75a/65692915378.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/jogaxe.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ugly+duckling+ep+1+eng+subPDF 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e6e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE6E0 15216 bytes
SHA-256: 54c46383bc1423577d620614003ec7f67636a4c62f76fd0fc1b75263345bd4d3
font_00_sfnt_off0000d4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C6 5284 bytes
SHA-256: 5df6d226aa21abb264489a9bc8a498cbc92917f849144c1f50d5c50be4735f33
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 11032 bytes
SHA-256: 05be617ccf7cf3ce7e552e8b4cc36fa954462104f483b2b79ac21f680e5f4ece