Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c50d43b467ba35…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 04:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f46ef14e55b604beb02117f86e04bf1 SHA-1: c07b696521e89db665c4d4b7edecb9f4505b8526 SHA-256: b8c50d43b467ba358ea2ef65ac1f638af619ae8322f39146ef700705d18c8354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=time+sampling+event+sampling PDF link annotation
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/fce9eb275d7a271fa3d07641f2861ec4/25815514662.pdfIn PDF document text
    • http://agro-partner.com/Image/files/wesuvosuz.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/47310477412.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109050508157875.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/eb116187b47bc5669d000937583c93a8/36238113452.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451f307f96d---sizegelam.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/79434023602.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/ccsoisbqm4ru8lsglrd4de7cd6/93704845049.pdfIn PDF document text
    • http://hk-keber.de/images/file/vijixukasepib.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/jizerimadelobovabogadeg.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/56786268265.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/9083629714.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/27486813535.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/ketabazoxiti.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/fulekometilubilexebex.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/39483913551.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/96206513967.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/16240238525.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/dovanunitum.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379d7f7f6c8---jejegetitadobowiramimerad.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/75299018349.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/21088549261.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/40945003321.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/xodilovotevo.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_off0000be67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE67 10404 bytes
SHA-256: c0f5db94839b33c2ce83788d871df3420a5788337ddc80ce5d8322ae0f23a89c
font_01_sfnt_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 16312 bytes
SHA-256: 198ca7e00712e7b3dcf1df19c7db66d66f8088516c4c9a6e08f4d95b24e74743

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