Malicious PDF — malware analysis report

Static analysis result for SHA-256 56527becc2aba874…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 21:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ebd2c28e59ecfbe18fa5b5dd9b65e6a SHA-1: 3561a076f4a56b1de480d0000f9a6b4290d32a6c SHA-256: 56527becc2aba87482832508db6fbf7054eea4b7aa1e37aea88b18089d9468ed
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common tactic for SEO poisoning or redirecting users to malicious sites. The ML classifier strongly indicates maliciousness, and the presence of JavaScript suggests it's used to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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://duext.com/wp-content/plugins/super-forms/uploads/php/files/2a30e3b6b981ac1dfbf8dcfa85149a59/viwebulesamuwi.pdf In PDF document text
    • http://plusk-car.com/js/upload/files/bususexiroguzenek.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/32723663786.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/84927158286.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/285988818cf931169376ac2c21625144/33997895335.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/56978059267.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/rodefotofutupibisu.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/tanaxomudalelivot.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/92925192273.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/mifigevupekejorabapuj.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/nepuxazenev.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/5091690212.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/17384822682.pdfIn PDF document text
    • http://xsteelstock.com/d/files/bawuziluxubebetamaveme.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/desereluvorepanojizifu.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/30620767013.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/mijoxuzovojitura.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fdf72868v4q80nj738aq9b6uo4/wezib.pdfIn PDF document text
    • http://roocenter.ru/upload/file/29121071010.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/viwesedidifuso.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75b1c38ef---2072689163.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/gunizomewarofi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/et3ml3crdlk8d2fo57ls6j0uc1/biduwanetanawimupumawawab.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/75b31901ef0d610416be698897033139/xusonasarilanuwalakapob.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/jawisewalaxas.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210912_891093E7DCA055EF.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/87129662148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=remix+os+player+emulatorPDF 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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 10672 bytes
SHA-256: ccb2054391f739607bbe8113fdd5dfc8b9b5d21b33c03e79e8361cf1b1751c65
font_01_sfnt_off0000f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38C 17068 bytes
SHA-256: 073131a117060b22df8234c5270d3f55c9bb414673b37ebc77fa4e5d4ac9de17
font_02_sfnt_off00011fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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