Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69bfed43872c98a…

MALICIOUS

PDF

69.0 KB Created: 2021-05-28 04:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b93041eff66b3423a04b648e84d4e5d SHA-1: 9197f984af808cdb9b93a57ab8ac49629b553058 SHA-256: a69bfed43872c98ae946d59a39edccdddd160d1812b47cd6810a313925890325
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document uses a deceptive title to mask its true intent, which appears to be hosting a link farm. Several heuristics indicate that the PDF contains links pointing to compromised WordPress uploads and potentially disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/155956123d7a9115066bc6bb62c3dbb9/86071970852.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091182f162cd---jodonazitukidamatixir.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/69d887684197e0c579bb372d646ad119/jefuza.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29067d557---pupukapixa.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090b6f4074b1---92143869541.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/n7pdr4stohcqj5jpqaa8c0f2eg/59281311687.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de39d5ca43---25968223022.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42903143b---7430558090.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88e75c8a0---xajukutezubawe.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca38d16072---23764673.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846063d92ba---xetupavonukamupoludidolaz.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5ff0d7f4fd7e757c69492baaf7d38068/juvukitifijezo.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57ed3717c---kulaganuwubotufutigigup.pdf
    • http://casier-a-bouteilles.fr/file/12652138360.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=catholic+bible+reading+guide+2021+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03e.bin
5b70ee1e3a577f268f12dec708f9f384a01178cc97e0a8d28b84804a54460cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD03E 5612 bytes
font_01_sfnt_off0000e34c.bin
57e4bb6d13106cbe3ce50681cc95b51e3cb45a7fe17de3c00ba3ccf0a50cd984		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 10692 bytes

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