Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3962c0b21c4fa97…

MALICIOUS

PDF

74.9 KB Created: 2021-09-25 22:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83ec889e68a1c8b928978729f082177a SHA-1: b305dd5b85f1cd9d5c55b5bce458d9bcd22d910c SHA-256: d3962c0b21c4fa97747f2957b654a9fb6f3f96fc27996d1d3ddc7bfbdce01411
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 storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=96+full+movie+in+tamil+tamilrockers+free+download PDF link annotation
    • http://seidels-mineralienwelt.de/images/uploaded/file/maxipagevejojimexadifa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16147c08218efe---pisanesetetiwugale.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/65201665715.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/91342928101.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/79114340759.pdfIn PDF document text
    • http://denge.aero/upload/files/totem.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/11532725895.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/kutinirajogumiziwodilake.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/43745695661.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/goluguwosozilunogilu.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/3534490999.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140317d3bca2---kolekibomovubej.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/davuvowuladevubamefofati.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/83613422458.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/rajesuzasupofijufanuwu.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/fiwan.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/tanuzefeguwigarubipejivak.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/52258472012.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/kovedudemipano.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/76292820979.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109222053555845.pdfIn PDF document text
    • http://zzquansu.cn/d/files/55655943912.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138873481efd---34161364291.pdfIn PDF document text
    • 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_off0000b801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 11220 bytes
SHA-256: 0d6d585e255ef0cd9480bb070327d881eb2259d946a2740444ccc2f84eceb1e5
font_02_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 19912 bytes
SHA-256: b1492fb9f4e3dc72c37e90e24ac86363ba856a65c7d156a2cf6cc1c7b4424828

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