Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9123e07179ba7bc…

MALICIOUS

PDF

75.5 KB Created: 2021-06-25 02:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c43bc9cb34d844a59887d4e44e3b9ddb SHA-1: d852230fef6e0bbb323a8d613a71dd5b901dd24e SHA-256: c9123e07179ba7bc90397770a154ab51cf6dc698365e91f053c86ff90577cef0
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 a link farm pointing to various compromised websites, likely to trick users into downloading a modded application. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nomylo.ru/uplcv?utm_term=anger+of+stickman+mod+apk PDF link annotation
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/jbigbfv29l3jtq8lt9qh9ph5sk/givirikexulupisewaf.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e51c31a1---13914569675.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/905bdffadc27c431a58889edf22c3e31/46149121967.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160889cb28a136---xupilutapujazob.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/30187222165.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b1e3e292dc740f9aa1febdb686201778/19106033450.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/46ab6d223d54b309317b117537cd97f4/bitido.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c5359afc4da423626ba86d824984bd24/91227290108.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/gfqp2v24jpvc76rk07pfi85edt/78573426345.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6d14a8c9---sodudonidibadujofo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160779314d1cae---28062452896.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/magirimoso.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fae6a7658---16557985971.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/elsfaj3egmhvkqoenijrubqnbb/kulamuxijasetemesafimidek.pdfIn PDF document text
    • http://lyshiying.com/d/files/36886357928.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f10bf6d43f253e8c0d4bcf5ffc7b940b/16268669071.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b50837d57---50307009551.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 5496 bytes
SHA-256: 66d1ed7ce52b56568f62141f2dd2352f56c868ee7d06e4d2b646a396adaa794c
font_01_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16088 bytes
SHA-256: e781858ba34e2fd1e172b227d70a9066caa7a7655ebb1c707863ca1dfda00de2