Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b62a81dc529e21…

MALICIOUS

PDF

67.5 KB Created: 2021-09-26 04:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 278d2900b803a51bf56843667d13197c SHA-1: 93aa3b5c4de51901df442e0307eb16360902a72b SHA-256: e3b62a81dc529e21beeb31ea0b54c313f5469b257d0cfc64f08bb094dded78c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://orig-shop-gsm.ro/ckfinder/userfiles/files/88608853167.pdf In PDF document text
    • http://naturabliskociebie.pl/userfiles/file/73817909101.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614824626f0b9---feninifizowuselinubib.pdfIn PDF document text
    • http://kondicionery-bronnitsy.ru/upload_picture/file/nutomejozagozopu.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rigebukew.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/6kd0v6hdlfottn60ra5miimdpr/92252772753.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/kokebodevovefafeza.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/pavumedidejuzemenepewiti.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/sanuxonidunanum.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/pomipojedapi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933ca4b46f---lomovevulewemanowitopo.pdfIn PDF document text
    • http://stringladies.cz/userfiles/69731812939.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/pibuwanakamebix.pdfIn PDF document text
    • https://htchninc.com/d/files/57491459471.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/5551404000.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/kebazuxedilobidofizalibuk.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/88415887696.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b260ee89b4---12717465047.pdfIn PDF document text
    • http://rsentco.com/upload/file/65625922733.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/2571e15562088ad4f409fff67948e177/52216327004.pdfIn PDF document text
    • http://01host.ru/userfiles/files/20070029386.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8c1d1af0cb272943689fccedd5c4244a/liwaradaliriniwemives.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ez+explorer+apkPDF 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_off0000ad6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC580 14884 bytes
SHA-256: 0a8ec3e641284280a794423927a9b12a2a29c300bae135b374b70148686fb64e
font_02_sfnt_off0000ead0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD0 10020 bytes
SHA-256: 26cf9cec761b92b2d6d29046477cc51680c65b81f1a035589a7af45731fc4734

Open this report in the interactive analyzer, or submit your own file for analysis.