Malicious PDF — malware analysis report

Static analysis result for SHA-256 3289f067d4aa09b1…

MALICIOUS

PDF

92.5 KB Created: 2021-08-23 17:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5d9a232d8b178bf638492ac9f81a72b SHA-1: d30d1e709d718d4561dedd0c847e531969fb65cb SHA-256: 3289f067d4aa09b1dadf653bb8d465ab10fafc556d391907cbc792b2f6960b7a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://oniceh.ru/uplcv?utm_term=a+remarkable+beetle+reading+answers PDF link annotation
    • https://aquafilling.com/userfiles/file/gositakot.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/xudojawix.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5840d1f9---zovutuwojili.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/15819081684.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/filifugepiz.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6vl3k1hunputi7uk2a80rac2do/tokiluzenabas.pdfIn PDF document text
    • http://honda-vo.com/upload/file/gotosogovuwezolujokosus.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/72c71c7fa6229d1a3f0231e8f420e261/dijobamikugadetog.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6bbde4803afacab94073652aebf727c4/35189821637.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/seforogegududimos.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/59ae7960b535434f0eb583aabb84a64d/78232101183.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/hmdtk5j1a44lvh4jb0b76q1k3k/venizebup.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a366feaf57d---todataruv.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fbf553ff05b0dcab423e0f75a5adf419/jaxepibenake.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160830908173a2---noviwebamel.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/70eaaa86df95e2ec01acd6301c6359d1/wufixutoxujudepel.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/27951481590.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/tatitutugufisubelokas.pdfIn PDF document text
    • http://artside.org/data/temp/file/30693805930.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160c57440541d8---wefozinijaburivadasikezu.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210610_034718.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/lojodugeravazikov.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/furujoroxedexopexovoze.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_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 17136 bytes
SHA-256: 6fd257079550faf5674e518b4f936c756502fa76e3270a9649820715e03a43ec
font_02_sfnt_off00014bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD6 10768 bytes
SHA-256: ab9cf126c761dee9631ab1e1715d832521d595ea7e70835a2fc7431a5c43b691

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