Malicious PDF — malware analysis report

Static analysis result for SHA-256 812c24e21d2909b2…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 18:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ddc4cf284856dfba5af310889dcd562a SHA-1: cebab7995cc431e30934b0db7bb17826df00dfe1 SHA-256: 812c24e21d2909b247182753dee9df51e5aa7946e12f0e2af872b81be8459c8c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and redirecting users. The presence of multiple URLs, including those hosted on compromised WordPress sites and disposable hosting, strongly suggests a link farm designed to distribute malicious content or phish for credentials. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://aylabawadi.ae/userfiles/file/35282803680.pdf In PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/zafitidisasi.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/1882810b084c86512d99618d316a6f68/mujizilal.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/20374796666.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/filoruresurofaribejel.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b0e39d2b---41231368683.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/vawizewojumi.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b5f62df3b---tuberovuxixopukine.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/bisavam.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/161348afe9df4a---nibiwinajasofidola.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/75720530414.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/20713837251.pdfIn PDF document text
    • http://planetamama.ru/files/file/33352786858.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/godorekuno.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/58271290987.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32172136712.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/98787467740.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/70193710815.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/feac9014b303867eedb2827b79a0b044/23117038502.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/zedamodejabadegexotilun.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/11201909103.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/kuwejuleb.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/zeboxolejilewosojizibuvup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ordner+ausblenden+androidPDF 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_off0000b8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E8 10408 bytes
SHA-256: 902f3d40aa96c517ef3df90e44ffa78b2b805cbd8c81f2f4cff3ae57c7da06c1
font_01_sfnt_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 18204 bytes
SHA-256: 18b7c387cf362bc670286eb53b0206dab82ec83a80b1f8703cf0db9df00e4730
font_02_sfnt_off0000fdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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