Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ec9388734615e3…

MALICIOUS

PDF

95.2 KB Created: 2021-08-08 00:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 43f2d2f870b2fb4dcc7053b705172d4d SHA-1: 68a9b6fecb00f1526fbf9486578a8314dde986a6 SHA-256: 86ec9388734615e3a8374fc8bfe3fccbe7dc5257ff54ed5bb1a780f198220a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160745f601e18c---74063498264.pdf In PDF document text
    • http://deltastal.ru/userfiles/file/detokugigulivanamidiwojow.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608776827a84a---kiruj.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e4a85b50d---94726995635.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/3513184957.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/30ccec939af45c5ff8f89d1c03ee4de9/84010269749.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c9808ded5---39460870467.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/sirozikofodafupixe.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aca8c54221d---fosupeditozaso.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c4118e8e5911748729d357317567b4b3/xetaxu.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/54167993998.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/80919335623.pdfIn PDF document text
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/41365585654.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/35c2e02a10fa46d48fd125c9be1a8e93/jinosiridixodew.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/kolimuwunojod.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/ladukurobekuxidixar.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/53458851929.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gj90rq9shkms1vf0j6rp53sdl5/lubujeluwelena.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080f37ad308c---weverupuvamuxejino.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/fofaxugevexudeda.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/xazilolarigeza.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/39385170915.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d5885b30---mugomivapi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857e813baa3---kares.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c26a6cbddf878a0c8491d53253f4c226/4580383248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tamil+mobile+movies+hd+2020PDF 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_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 10624 bytes
SHA-256: 3392a7aa4f9eb44dcab4e9ad1dee69d0e6090071b266a8a1e4ca6a62200f0d64
font_01_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBF 17912 bytes
SHA-256: 9a3a9cfc7bd1188299cac384403295d3d64720141cebd7ed6d14b588a3dfcbde

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