Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe13fc3224472f64…

MALICIOUS

PDF

135.6 KB Created: 2021-06-29 10:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bf01acad0a3463d2c5545213f87b9eb SHA-1: d5c12c831521a9b15f2d5cb5ca6cf3c401fe263b SHA-256: fe13fc3224472f642e700839af7f7e7a673ab5181b0328022646c76bcfb5981c
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised websites, suggesting it's part of a phishing campaign. The document's content, indicated by the 'ClickFix' and 'Security Bypass' heuristics, instructs the user to disable security software and execute commands, a common tactic to facilitate the download and execution of a secondary payload. No scripts were extracted, but the overall structure and heuristics point to a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

Heuristics 8

  • 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
  • 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.
  • 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 http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f493544394---guramozax.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/cd17e348c23ee241fb9812702f15c65e/rokonigabixazawinesuw.pdfIn PDF document text
    • https://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/nogak.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec71eba9fd---27076102395.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7db82223e6e950da6ffd2a419abbf111/mowiderexogar.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e4fff0adeaf78c66ed83cd5dd28f1fed/fugabojevixolomovugukewo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/22626303756.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828559f2ad4---99472966852.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/vr8qv5m2ohlp09hq0k70m81h84/83241151917.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb57361b83---20363779294.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606d326b0ffd0---1880590484.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/97072585425.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/66846e1d2c655277504167d01d0534a7/gaduwomifilijivukenujani.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc232f1a8---55954411220.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8e695f87aa8c0f5d5afbb5eeeb8558b4/nibugapu.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/a069995eec70c066984e03206c1700bb/96518903905.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/a4465f5af7f50a756202f373157b190f/woxojenobusivosexujajar.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5ea35bf5f---17382184254.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160768158cef91---41923882488.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ddd30661---xagiziteganadetug.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/56087670381.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccdf4681ed---67572089393.pdfIn PDF document text
    • https://eternalbliss.net/file/kegawolowoxevegikaj.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9da91bd5---44628969898.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cef4209da3e---xasawapavaguburubasuneta.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/wufonifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=kindle+fire+hd+manual+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19753 16436 bytes
SHA-256: c37178892c861234b5c43daa3867ea72067c18b8f03b9054c919e3ea65bc529a
font_01_sfnt_off0001add5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADD5 18428 bytes
SHA-256: d9260fc9a9c5c6d82dae8ede7a247b42ccd0bbef9992370e445eaf54abce38b1
font_02_sfnt_off0001deb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6CE 10532 bytes
SHA-256: fe13b8d1146e66d38675ff176e376d4563a9e4119ec94a97db614f68b6d0c080

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