Malicious PDF — malware analysis report

Static analysis result for SHA-256 b073ccc67555a0a4…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 07:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3a03a2c10bae1e9b17f6a2a50d5e95f SHA-1: cfa808972db4791e3f0a4bb94a836b0c3dc9d071 SHA-256: b073ccc67555a0a4fda4a061bb03158fcf379ccc39315cb10b6b00ab768c8fa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such sites, likely to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://coretry.ru/uplcv?utm_term=muscle+gains+natural+vs+steroids PDF link annotation
    • http://uelzecht.lu/userfiles/files/rezujetelovixovix.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/60049640502.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/64002285005.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/40576908213.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090419075932.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/6262425171.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/linunukurotufufufir.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/86808313333.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed378e75f3---ponitopotufuzajepej.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/7941926414.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/juzoridulegeferu.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/mofavopuxufarev.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a0474fc0fe068be44c249cdc278e04b0/37495675392.pdfIn PDF document text
    • https://advik.net/userfiles/file/46331783952.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/71027580949.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cef43ddd---74510959883.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/9058831105.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/ninuz.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136da14073b4---biwarolimaxixusasuk.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/17510160815.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/54339856010.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d91f7bc8b---13470765318.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/padomisijomijujatasodasej.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_off0000c7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A3 10704 bytes
SHA-256: 4f593ca78a05eb7cb60bdf44c83f60d2401c55bac627786e769904df886fa725
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 16916 bytes
SHA-256: d04f789c79fceabc5a1c3ce5a8d1ac1d87b2ed7fc14219535b5a949bbed9f053

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