Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4d2f1e322c4534…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 01:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46dc18cdf49eae260438c54c45edd188 SHA-1: 7202631c944cd85433227bb857c6b40620dd7fde SHA-256: ba4d2f1e322c453438a07aba5eede06226359dc2e003bc1987ac29fda273c62c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detection strongly suggests malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • 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 https://synerhu.ru/uplcv?utm_term=diablo+immortal+alpha+apk PDF link annotation
    • https://noble-program.site/js/ckfinder/userfiles/files/budugibimirimogup.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/71414208158.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/tovebujebafukap.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/kuvibelelagafexojor.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/xarumamezesapopa.pdfIn PDF document text
    • http://qdcmd.com/data/files/zivefipi.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/89796578792.pdfIn PDF document text
    • http://gibisch.info/files/files/dukazuta.pdfIn macro / runtime command snippet
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b2e7672b2---fowuzelipimotegozosit.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/zaxunapakikizotuf.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/64716623931.pdfIn PDF document text
    • http://vanhacollection.com/images/files/74239050573.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa2b7bc573---27204608562.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/1550998852.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/nalixat.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/zukininibodexomadegaguxip.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219294676173.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/lalobaraguvawunitulisoj.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/36499194770.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/59t8gi08063oqn9pjr51mr6va7/rolamodiwilabimij.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/mumewozevenofojumilojat.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/vilitapikepedaxujar.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/85725160118.pdfIn PDF document text
    • http://ergakiland.ru/files/files/jidobikel.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/tonidobimonil.pdfIn PDF document text
    • http://studiospazioambienteIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB341 15188 bytes
SHA-256: c2011047632bc51a29c5c95dc03e0c96e8581087fbaa6024a39201d8dd023fc6
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 10348 bytes
SHA-256: 654c2d644e8c1da227a255b0786e2683f71bc80bb92dffef451b9fd793a59ff3

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