Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68585b82a23762e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-28 03:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2509fe8eba6197e2d150d2097ab2fcb4 SHA-1: 4292b9ae4695c2261dc6bdbadc61c05f51800386 SHA-256: c68585b82a23762e84ad30d2013c1813b60a9ad7d32b8a76f32a4f6dd4cc48cc
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress installations and appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL targets suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd8124d83f---kixabinipofurobivukek.pdf In PDF document text
    • http://altelaw.com/uploads/image/file/binuduvurexuw.pdfIn PDF document text
    • http://zxsolar.com/d/files/11793869623.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/bigumopogosositarigev.pdfIn PDF document text
    • http://partnercable.hu/files/94676235284.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925835f31a6---nobawi.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/wajodaseloguniro.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/riwixodatobenewape.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/61153949444.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05c858f54e---25344008935.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wexigigojovov.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gmjdi1ciqhcqa2e9gjnoit2d82/5511539908.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/53514497850.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-20/20210520112910832675.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609498adee9b6---kewokesawuxebukurola.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/mijanureke.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/66809778113.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e33db1c52c8---70181988424.pdfIn PDF document text
    • https://mbbs.hr/files/38816974216.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/80520237318.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d45d1b8777c4146fc94e2474ded8de4d/93857742418.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gixewoliginokunirewefama.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/velopuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=beginners+spanish+dictionary+pdfPDF 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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 11020 bytes
SHA-256: 074727ce4707dc857f00650d4149a7498c3a0399af5e30a7f22f4e9afb962f20
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 17980 bytes
SHA-256: 90aaaf74328b5e6bc8fffa18635791b4ef6faebc568e8110a3836c9971743fbf

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