Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8a9af022ad73a7…

MALICIOUS

PDF

82.8 KB Created: 2021-08-27 18:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 29c896fe374d9e9ab1d211009affe762 SHA-1: bb220a9ddcff2740da8ca05115117069322086b3 SHA-256: 5c8a9af022ad73a702ebe9987e5cf11bb6999640ac42f9f7ccbade269a94d27c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. The 'SE_CLICKFIX' heuristic indicates that the document contains social engineering elements designed to trick the user into executing a command, likely to download and run a secondary payload. The presence of numerous links to potentially compromised WordPress upload storage and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://nolimitscenter.be/peausitive/images/FCKeditor/file/48509447647.pdf In PDF document text
    • https://juvelyrikoscentras.lt/Files/file/72802628562.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160792ac11b368---kenafamoso.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/7667077798.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/vojelegawofexunumubovav.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/28388779415.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/vuwet.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/28909079207.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ivmst5jmengc5r5fi7ftgor2h7/tigomiramelinaribegusom.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/7863008543.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/736aa368f484113c54b65dd8778f79f7/31940593060.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eeb750a9e---96029895865.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/wifikuxi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kofalipaba.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/biguvowufezegexopi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe878e231a---guxulemi.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611d1b58b3f34---668691038.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/pinudidafowilitesigewol.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kesevobasudujome.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/53032744050.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/15605574745.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/47541474892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=windows+event+viewer+command+linePDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 10676 bytes
SHA-256: 63cfe9179b6d228be47afc19b8fcb8dcf3ee0400a7eebe5352c8c3878f64b6d7
font_02_sfnt_off00010e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E82 18044 bytes
SHA-256: b168750073d578aeaf81846c7216e453cee163d26e9f9917463f080d809fbff6

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