Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0f0e6593e3074a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 03:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc76e1a9630c90c46a05d3e237403808 SHA-1: ba7e37fe0f7f2ea2875a0aba303e444396010b92 SHA-256: fc0f0e6593e3074a2b7111ec7e747f5c155258721adf727eb49e160429bb6c35
196 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the 'LOLBin token sequence' heuristic point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://synerhu.ru/uplcv?utm_term=audio+visual+media+in+education+pdf PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/lipobubafumubedokuxorus.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612b877f27c06---jakolonus.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/sukenulel.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d3d1295478db6cab01f5740d26fd43bb/menedifagijuxulusaj.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a752f90b8ceed16f6b9ec3e304ef4550/zupagonezomivano.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/wafupamiwomo.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/18765730257.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/pejababonizeviwa.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6c744a7d5a22bb2df9603ee53e7fd94b/46253420095.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/medelosepefi.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9db458da757fe1e8ed9224834463d9e4/75828326865.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g4hmb0jkpmd5kgu657d6k0oocd/vegavijujupegivudusenoxa.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161160de586d88---zikobetovajasuko.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/vezakalivigejazolokuv.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952ce7ea0de---fexusuwulusojoziv.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/54122889820.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/65590506649.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rftgdleocmd0isidq9t8ukbrf4/vurusutakofofomug.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/67689343451.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf646873c5---19739449996.pdfIn macro / runtime command snippet
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/zigekidopefitegopegowusi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3bf8fa5ef172e5ab1e4ed2f5ebafc435/67082778221.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/68102456904.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/gajidatuwofirofufibu.pdfIn PDF document text
    • http://rent2day.ca/In macro / runtime command snippet
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D8 10828 bytes
SHA-256: a5e752948bf2c39bb28e494dd9736776370bbc15a63e80f17cef055bc0fe5d98
font_01_sfnt_off0000dbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD5 16920 bytes
SHA-256: a2203092e265eb0c4d26b8688080f787c71122b4b09533c3edaa0917b77e1c1c
font_02_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 18900 bytes
SHA-256: 3cef7f6f166f5e81417b668e6e8c24c0fc32b0cbba3ba2bf6b6a5fac67d0f4a9

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