Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceaa8f4b6547ee7f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 21:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aeadc30fcbddaf4e6f923ce3c57d9ede SHA-1: 7ffd6c8ab40d26419656ae19dd076d639acc3b4b SHA-256: ceaa8f4b6547ee7fa2cbd595105b685800beab9c6e950631948e6ddae2302854
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to malicious content or the download of further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=grama+sachivalayam+syllabus+in+telugu+2019+pdf+download
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/wututim.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c1b3cc30e---rafemuwezonid.pdf
    • http://tdvvietnam.vn/webroot/img/files/lagisubakabamifida.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3b920f80---57236576467.pdf
    • http://sunnysolutions.it/uploads/assets/file/50909374709.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/21816961698.pdf
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/92554772329.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/162c16ca3f16474559eae14539aa7571/nufofo.pdf
    • http://kangs78.com/clients/66216/File/46801751491.pdf
    • http://fredericjean.net/oplusco/file/torebinodugidelorofalew.pdf
    • https://bleikss.com/userfiles/file/89012212708.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/486811482b7214e2c88c83ca18f83b98/27221152308.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/91014823539.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a7ec613d---92722492322.pdf
    • http://transchem-tech.com/Uploadfiles/files/rifero.pdf
    • https://fullprotec.com/ckfinder/userfiles/files/50040092346.pdf
    • https://archielectronics.com/userfiles/files/37175998087.pdf
    • https://ottopianos.nl/files/12478414453.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161251a0a9a0e2---8565280677.pdf
    • http://thepokeluau.com/uploads/files/46345286269.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34afa08674---bepur.pdf
    • http://carscaso.com/js/upload/files/kobowaduvopewibapu.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c81a61b8a5637b92207522dcbad290b8/72431644121.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/motagufaxotat.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_off0000dc04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 16792 bytes
font_01_sfnt_off0000f41b.bin
34b3dbcc40c6e0292e8980c176acc9e0961c530c6d9bc30e7ae157a7a986ad56
pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 12076 bytes
font_02_sfnt_off000110cf.bin
45ed9c15ef850a54b95a4b80fba584849d26b74274660fda51eb2f004da92c17
pdf-font-stream PDF embedded font (sfnt) at offset 0x110CF 17492 bytes