Malicious PDF — malware analysis report

Static analysis result for SHA-256 7401905bd0174a99…

MALICIOUS

PDF

96.9 KB Created: 2021-06-10 23:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7118e4b248e9bc24ed7ade5105117ca1 SHA-1: a1d32345eb2f531dbb4ce4db2f35b95b1c4a5374 SHA-256: 7401905bd0174a99831bfa52ed84d63287ea7e00b2073665e65c29c01ee54ce7
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, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/uplcv?utm_term=marvel+contest+of+champions+mastery+guide PDF link annotation
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c2a587815eccb17138e92d4a9fffef74/80813523367.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/59245952485.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/25525209681.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070270883603---75583470726.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/mevesoxabuseni.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/35597940759.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160853cdb1e059---lazasob.pdfIn PDF document text
    • https://arerp.kr/data/file/%5C/kusir.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1c06de1f2---15563520254.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160731eff34829---78758169342.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba39f300941---xofunubimitotinebeji.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/sapikonoza.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/qvpdu3r9d69andqlneadi29e41/55635256832.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/sidunekiwejakuritokut.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gofolikokixera.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4065b7961---kivunuragodewagidumup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.youtube.com/watch?v=VRPXxHrgDnYBeginnerIn 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_off00013b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6C 5736 bytes
SHA-256: 962f2d090833c560e1e4dc8aa5dcaf76e5fa2a1e28d0cc908a6df44e53bd9884
font_01_sfnt_off00014ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE7 11864 bytes
SHA-256: ba63da082a9f0be3fd149b03f8e2be10f6324a5f53178180da4f922a75633fbd