Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1a15a177c5e39a…

MALICIOUS

PDF

79.1 KB Created: 2021-06-12 07:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a0be86c630f6275b90a6dc4d82d2555a SHA-1: d506c4e5030483c0f71cf71185d3ca1d8433dd69 SHA-256: ee1a15a177c5e39a6c6c76ba9a6d2893f49991f1ad3b4796879f82ebe10a4811
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Antivirus Escape Through Host Interference

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and trojan distribution attempt. It contains numerous links to compromised WordPress sites, likely serving as a link farm to host malicious content. The document also contains an explicit instruction to disable security software, a critical indicator of malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall heuristic profile strongly suggest the document is designed to trick users into downloading and executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=simcity+4+deluxe+edition+download+free PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/8ft3gv3s7kjt2eauq0e513miu7/94145095727.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/47a9c0ba8dce2de6bbd72b46a1a971a6/2165612815.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/qklpmquui2onaosvr6nrb4rhus/fejag.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a93c5d690056cf42c488ba899fbf66b/xozirasenile.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/7e1986c56ba030432da281c211a6f816/76495865873.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210609_7CBFFAB57434E2B7.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1917c445ae48c8ec3250ec367a78e70b/11912223160.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858ba9603c7---duzagezobezovivegarev.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cf831827a89cc84b17ef431cd039177b/lodovakedafapisaxitox.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/94466595401.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/73088284417.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/92225378036.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/forimirabasumalogev.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/35431b644c8586000a36ae142f978fc9/79492309040.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf1ee5843---pobebun.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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 5440 bytes
SHA-256: bc780f12b65405107d8ea456780bc988fd0ec58848b918eaa68c00bd836847ec
font_01_sfnt_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 12100 bytes
SHA-256: 9f6963e0d0544350825138e721a9e4a4439e44338c1022750f259f0f6168017c

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