Malicious PDF — malware analysis report

Static analysis result for SHA-256 41115f4fd5b81a85…

MALICIOUS

PDF

92.2 KB Created: 2021-09-01 06:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: eec4a26011f2dab7a08145f92b7ebcc8 SHA-1: aba6cbbf2b6bdc4727ca91a4b9534510a3273a61 SHA-256: 41115f4fd5b81a8549ffc00a004569ea9adbd7de5bafed5bda7cda5a79f1c745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f49768f1---gizosasupepegudalejeji.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7ea9f5ca59c6fad9e4a0048213bd7822/46908436120.pdfIn PDF document text
    • http://fitviewer.de/files/file/jejot.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1a564ac47a---60812818855.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pvuksadd8871996kls1j0mdmd5/75401610197.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/tarezanagega.pdfIn PDF document text
    • https://hoavily.com/uploads/files/52040177483.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/23lt91fvp3odh7248fktjpnffe/dituxefuguvusipago.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4ba90c3d264fa76b2a04e1301a2dce6a/pogusokaludapomuluv.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/16282741167.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/wuxatemanolisavapilaki.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/kadoxozalojebagosi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16110745808887---22348843029.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f3c9c14ed8e0d482985b5a53974d5546/35175060225.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/nozavitatudepefuteruxuvom.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c100abc5---zakazonifo.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/doxepufeb.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160797d452a193---60523275932.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d28ef03ba3e---60841420962.pdfIn PDF document text
    • http://ridendo.cz/files/file/xidozawobejidafame.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefdd53243---24636995537.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210524210703.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/falib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=those+that+want+me+deadPDF link annotation
    • http://irodori.kir.jp/files/file/rorironowoxasefufem.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_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 17968 bytes
SHA-256: 0df71afeef9df665d19d05d99344965c9f062ab6af5e2bbf44f52ce9edd74fcd
font_01_sfnt_off0001341d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 10324 bytes
SHA-256: 9aeaf7d96babe4fa957c23a1cbe655c6f09c3211ca7fbacad6e20c3e92312d56
font_02_sfnt_off00014b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1