Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f8b1129b4bfac7…

MALICIOUS

PDF

91.8 KB Created: 2021-08-23 17:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 698c5f3074a77b66c8c620b92b811eb5 SHA-1: c3052b367ca20804b64044624638dcbf7c8967dc SHA-256: 56f8b1129b4bfac7676d34e4e68bbd78e4e3ec9bfee92e53d65983bb81da4da9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The PDF also functions as a link farm, pointing to numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting an attempt to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://azizolace.cz/images/file/rewuxugigitolujozur.pdf In PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/8ebc1c11ba3002be94ffabf947b7f619/fivatekadopagedozeke.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/e2c6e251e6c567a18d281755252d74d7/xuvumagaredevo.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/83705794292.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfbafce9d5---38995564734.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/refedekejijedujeteleg.pdfIn PDF document text
    • https://dafelia.com/files/sexin.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d247da051---kavuniviru.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c53ddf5a0a0364e1c4a7694b8b2632ac/62927102344.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/81220631519.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/mowadowexilibipurofenak.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d586f97117---39264305511.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/34124912317.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/afdf24d150ad6c5a99bc425388604c34/76394530789.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd8409f33---saruzesozepuva.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hf0qudkdr7cnh7mthdp7ej01i0/gerojezibizisiroposevito.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/75603923135.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/91400408867.pdfIn PDF document text
    • http://www.77ice.com/upload/files/vinapefoparemef.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/58mgrrs34gmj9vidqhaf1jd9r1/40776225338.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/93096016130.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/cac7d73e09cd3a3b22ae382176d6265b/todekobunoniruruj.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/jagajutulidajerob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ancient+egypt+and+religionPDF 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_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 10616 bytes
SHA-256: 20e0fd51cd94ef4443b2902bb047629929e74363ff6d900c7145fdfd3b77b86a
font_01_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 17332 bytes
SHA-256: 220a95f3cd5bc76cfb313a5a018893bcee735461376c7845ee9a1ef5e02bd2df
font_02_sfnt_off0001481e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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