Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bc582dc69c3dd5…

MALICIOUS

PDF

92.4 KB Created: 2021-07-22 00:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ea74a0527c3ff357304f0b1263cd69a1 SHA-1: e547684a85296432f9ce794e8ccf9d0f0fd9a791 SHA-256: 36bc582dc69c3dd59c64253bafae99aa684ce6229c0e788c5e077bee2817ddc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/wiritiz.pdf In PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/761d62569d16e796f848bfdad52af956/magivugajizunufoduse.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba1e37ad2---naferujajujiki.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/se6gm5piq8g3paef10h5ve2r1r/degusidoxaguwuxe.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b983879cf5---3745667925.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///41343437917.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/a872bb57a395e9f487d4aec582ea36fe/8985678473.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/waxekopesuvifi.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/e7fakrjtovrjmfp2npu8q2t2i3/94897576829.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/3fae4fbb7b711c8af8c322c92c2be0bd/dexux.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/81965618877.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/divaw.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a36389b6b60---vekawedizomofukovezutesi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da59c076857---tojajifese.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce0546f9e0---vuxamosasexefukenave.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867a92499bf---pegezatoxovanogin.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/9766955326.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948b926ea61---letudarelurozasexusese.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a51729925---duvaxovevuxiseveko.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/famenefake.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/0ae5f274bbad6442e6009118f1ea7685/47096449094.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/36297380394.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/rokazipuw.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/22719082710.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/pudodixigexam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=google+indexing+pdf+filesPDF 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_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 10456 bytes
SHA-256: 043b8da5a0b50488c40727c120e71179eacce48d4c61a1b562d72f12fa6cbb5b
font_01_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 16740 bytes
SHA-256: 50cbf785ff48eaf1243ac05d53bfff0c5708d175729125d55dacd91323fb8fe8
font_02_sfnt_off00014be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1