Malicious PDF — malware analysis report

Static analysis result for SHA-256 3633e0cedd37e78f…

MALICIOUS

PDF

77.1 KB Created: 2021-06-29 05:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 089f61295314999425089895809b0455 SHA-1: fd046e8de5b6c8ae5a770dace90621e8104473ba SHA-256: 3633e0cedd37e78f83cf6ec277af12ee99ca2d7e5b874e481cc2f77a1db62f92
164 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 compromised CMS upload directories or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://grupahatak.pl/admin/_fck_files/file/wisamipinode.pdf In PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/megokilif.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/zubibobosizixumixeginuzu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/pm754mnrtp4kl2gmcri5ccee40/daxatoduvutegorum.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/bbc1d0a016a3c146ff3a2fd30c42b2f8/daxudofavuna.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/0v0ngavh7hno3fmg27pgt7jolu/42464310660.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989b21789cd---dixikurilugus.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/22552607331.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608636a9a40a9---74040262659.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/vonaxopagenifidaka.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759db19158e---xutijotigelifusut.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/2029695505.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/872386516.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/74235482976.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/565b9ecf619ced9e7277d12150ca87de/sivedulagavagupedipo.pdfIn PDF document text
    • https://motacademy.it/file/jogasiposo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b37280b90---38189465644.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf4f68bb1---megonugesadalowoki.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bee9af9fa72---gogopoxodekenesi.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/ferexufovol.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/lakiwoter.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/zekaxuposekudojij.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/46417603536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=behold+him+there+the+risen+lambPDF 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_off0000cbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 10708 bytes
SHA-256: 7b7eb80c93906bdbe1221b85649e3deea3e2c9a54b8e1a62c3fae2f147873bc6
font_02_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 16576 bytes
SHA-256: 916079f032089535269b6ad2f9c5a72d5fe7242fe22e4b55424134d231c31b1a

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