Malicious PDF — malware analysis report

Static analysis result for SHA-256 67165e695eef9feb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-01 07:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9bcf9b2b7757f225020afb0afa885f0a SHA-1: 4422c77da99d52f4dd381d011f81c254a04efe39 SHA-256: 67165e695eef9feb1f96fe180d4e6e09f30bdbdca8541ba5455ea7f9d5de1196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external URLs points to a watering hole or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=aesthetic+notes+template+word PDF link annotation
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/folufigedojux.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/0dd8ca16ecd9f581acd7814bdb183f09/sajeko.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/29687316671.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8fe447965---48006509140.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kp9dr1v0an5tausvfung42qdh7/375783412.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/33254354230.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/dubiwozoxixeremujebofinev.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160722dd80a97f---jojazexixomom.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/vogavoz.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/45455159335.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606d469b85f8c---44623991883.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/87226172577.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3c0e48ecc---tonelusixukekiramebabopib.pdfIn PDF document text
    • http://pololanna.com/user_img/files/boxidu.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/veseranusujezo.pdfIn PDF document text
    • https://aspirans.com/files/file/kisuz.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///fodufusosomekirij.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/84167281432.pdfIn PDF document text
    • https://yuss.it/file/xufosukonurezadabukexeni.pdfIn PDF document text
    • https://irantruck.ir/data/file/80890050753.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/bipagonilixaxikeliteperol.pdfIn 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://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_off0000b59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59B 15564 bytes
SHA-256: 459d84189cc980dd02294544227997215a99a9393694770dc460e71c8aacd0ed
font_01_sfnt_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 10848 bytes
SHA-256: 51e3ba22407d919c86c190b5ce75da95c8aaa47628c6e67f76e6e789cdc64598
font_02_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1