Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4ea80e48ad62ea…

MALICIOUS

PDF

97.4 KB Created: 2021-08-17 07:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51fcdca7613f81883ba42dcc12f82074 SHA-1: a8313a8e870ab47a9c216706e2abd65da5bf8aa9 SHA-256: 6a4ea80e48ad62ea1a98470f06a1b9826e91b657416ddcecee66e359eafe5515
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URLs point to a common tactic of using documents to host malicious redirection links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=bible+study+topics+for+adults+pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9771b76462867bb6add8a887fc154eb4/xigupesuguxun.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/82004360549.pdf
    • http://jcpingie.be/public/files/sovuras.pdf
    • http://blevy.com/ckfinder/userfiles/files/pozubonut.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/baxeramirupagavifabomikum.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd51c3df81---goxagaxakebetujape.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083455492052---1823329016.pdf
    • http://abwrichmond.com/uploads/files/58498127108.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca9a3fd34---wesuzonajakajupetanika.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161122ba8f0a85---85162140737.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089fbf165b3e---biwoju.pdf
    • http://geniuschulatutor.com/userfiles/files/zitop.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1f13e690b---mavonisav.pdf
    • http://fruitvita.com/files/files/37815063422.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091132736b27---mubemararuwaxafuwixewa.pdf
    • https://vildmarksjagt.dk/userfiles/file/voziru.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f3ebb8e0b---88024796511.pdf
    • https://najlepsze-w-polsce.pl/uploads/vetimufajexodu.pdf
    • http://somsit.com/ckfinder/userfiles/files/lulefurefali.pdf
    • http://geo-equipe.it/userfiles/files/90277609777.pdf
    • https://ehlibeytalimleri.com/resimler/files/95035680757.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096ea5e5c713---wujaladixiwojilusiwu.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0c248cde---rininigonemezoruvo.pdf
    • http://davobio.com/upload/files/73233119768.pdf
    • http://batterseataxi.com/survey/userfiles/files/69663253860.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc77e8e8a0---10416506531.pdf
    • https://bilegt.mn/userfiles/files/dujopas.pdf
    • http://archerelectricsupply.com/userfiles/file/bikumodozosedepa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011736.bin
5d49fedc7f3f46ef710acd9fd288c5cc23642ee97ebae7ac792ae06ec709144a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 17816 bytes
font_01_sfnt_off00014561.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 16792 bytes
font_02_sfnt_off00015d78.bin
11f053daa6c7d33161d84075cc10fd4dedcd07c684f8f24f1dba96e04498cd69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D78 10916 bytes

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