Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87e2155baa395e0…

MALICIOUS

PDF

97.3 KB Created: 2021-07-24 19:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a5089ea7e3aebc4d5137001e5f7aa59 SHA-1: ad0c6ae6a88fc3e493fc4eb01052adfca717eeff SHA-256: e87e2155baa395e05eb19e6846b8720c834d93368ffdc678182d51d4afd013c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The structure suggests it's designed to lure users into clicking through to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607900c5e5798---85648908661.pdf In PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/94004117016.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/67061414812.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/11003525312.pdfIn PDF document text
    • http://sireny.net/share/files/radomonisakawurerigomo.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/genena.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014c3891c9---58447677223.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/sojimefowigajotisogepizix.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9403e515---vawovikoregakemoze.pdfIn PDF document text
    • https://sce.tw/uploads/files/60e051949022b.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/q30qhe930544quc49g65s5rcb5/fuzaripetobuxonif.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be03d7ae82b---kirivobo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e50fd2930b59ec799c0d98deebc7bb92/nijafedipelewutoj.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/luxilikel.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210703035246_3ai2ga.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/34293853937.pdfIn PDF document text
    • https://brod-plovdiv.com/images/26938928228.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/20622750015.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8tud36ed8jjpksp1kgkvi4b92l/20130393687.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/23079281798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=weider+home+gym+system+exercise+guide+pdfPDF link annotation
    • http://www.flickr.com/photos/mnfiraq/In 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_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 11064 bytes
SHA-256: 113665d7565677576e98e2c456ba4a62d1a76953279a8f32c1137a49473a173a
font_01_sfnt_off000132ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 17156 bytes
SHA-256: 0c49b683d548eb1e365cd20dedf079e6b6f9776fb9553242de45ec6d3fe3907e
font_02_sfnt_off00015f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1