Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dd20990533c50d…

MALICIOUS

PDF

159.7 KB Created: 2021-06-11 09:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c788b22006d91d67d2c5edc58076ea84 SHA-1: f9a094664f64ca5e6055c0a46078f05276a5f072 SHA-256: c1dd20990533c50d1ff7a88c2f327c2f02b290e99614c48a69781fee3fafae56
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or scam campaign. The document body, though heavily obfuscated, contains text related to 'Iceborne custom upgrades', likely a lure to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=iceborne+custom+upgrades PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a52669d5afe---rikifenolibevanimixo.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/85681512222.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/22a76d9d2b7163de64449357f1e11d15/mevunirukusanejan.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/sikibokusonepado.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095856a963ea---vobefamuk.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aed13d7a35074d9cefe21ec030c65302/51848765700.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4ae2d4a257ff74ad6687adbeb88757b4/32397564703.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0c8efe5ccf1d34f6e71f2af5134f5325/wexekilubinegiwi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d9ece246---74842880143.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/488a8b6856bfeca5e3d565b937d837b9/pemugomulitapi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/39b9251ec4c0e811e66a8cf60936753c/wuvaraz.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wovesuziliziba.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/jorefulixidi.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90ceaf026---49918301139.pdfIn PDF document text
    • http://kco.su/userfiles/file/didasobevafojamugazir.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_off000109c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C0 97420 bytes
SHA-256: 6cae5ad9e79c9fbdbc69cb89be32aa12e934293eceb63626875259985d5b5418
font_01_sfnt_off00022b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B65 5272 bytes
SHA-256: 803f9e0aa374dc46b9896a2ee57f8eecf9807a34558d337bf48090cff4927fd5
font_02_sfnt_off00023d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D19 11480 bytes
SHA-256: 7f1e46626f3abbae4c06017148202c9bc2dd59e3a8c7c214b8564b17b3e6bf37
font_03_sfnt_off00026343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26343 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176