Malicious PDF — malware analysis report

Static analysis result for SHA-256 396bcf042fe109d6…

MALICIOUS

PDF

84.6 KB Created: 2021-07-22 01:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73739db44797619eaa0fb4920e0f0254 SHA-1: afc5097b41ff60965b0d3bda23870f64b3081440 SHA-256: 396bcf042fe109d6bdae57b97fca6e2163a7dae83b0c54c45078f904e0a61aa4
104 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to host malicious files. The ML classifier strongly flagged this PDF as malicious. The presence of a 'download button' lure further supports the intent to trick users into downloading a payload, likely disguised as a Minecraft texture pack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thietbianninh188.com/uploads/files/kapavabipolofojivenat.pdf In PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/u2h7cf2f23dl4u3c1tk59cgnsa/juvogegulikezit.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/84783240462.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d32e4760935---viteziwejekofular.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/39f42g2g5uvq9jvukvil975j3q/65723820435.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/73191375379.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/8l521od4986n0imofvkkudle1d/rezufawiraxujimivupes.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/dexamisajewivamiwe.pdfIn PDF document text
    • http://hydrem.ru/images/file/91674919932.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ee2n5017vn06pab2ilo9970taa/wefitajekuwagifalelufibir.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/vopubudeketajojogedirak.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2de57212819rcl9o4m9pp50p3r/kavubijilajeso.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c6f2cd8e7---dunujixarud.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f83a3466---lekubigefenej.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/52f05592bb270d767254e8b002a2e461/86471159171.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071e03f18630---kodogoxolumetuwopawan.pdfIn PDF document text
    • http://tms-operation.com/upload/files/82588761208.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/60704566091.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mukuxefiparesexagowalo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-12/20210512014520587142.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7487daf016---8237048772.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0381cc2402---4374192443.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/verezinobigijig.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/janudiwuxexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=minecraft+mobile+x+ray+texture+packPDF 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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 17056 bytes
SHA-256: 82a2cf7132640198bf97fd4df710d2cd6a2a29c7a5fccda0af62b02627ee1137
font_02_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 11016 bytes
SHA-256: 612a573a274641bd108f48bdc69d87cb2c973a2001a68f904584774d42ac69d5

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