Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c0d0e8cb3e6418…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 20:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b8cb850d19ae1a741793f5f6e994d315 SHA-1: 15fa8d318a0e91778c1db5a65c3f1182b36a3ab1 SHA-256: 85c0d0e8cb3e6418142de8579c480197aa045b26c2eb5fd932570e3750f74849
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual content, but the heuristic firings confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7974

Heuristics 5

  • 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
  • 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://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/be9200a90980bb0e1ada11a535c59d96/sazigakukojo.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3390b12b---dolanorupuwewenejojeto.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vlvd74pg3mf1ete2f306kebhp2/mulalekuw.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca5d743e25---68374285549.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/razatidupavegebo.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/pujitebagemivasoje.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161190783b7192---dujupuwomosuneriwub.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/rikuxowezamuxexuv.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/nudedowumefaru.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zozesitotirosenaf.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/54823708843.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/50482512737.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/28269aef9f1c116527532035b37a72f1/35809215484.pdfIn PDF document text
    • http://machulski.com/public/file/26327750647.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m6fb2oegv538rtu1etkljv3mjj/gawetelus.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/49119332286.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/45175724763.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/hn9ko6clfrcictu7bscl073ldm/josetowinawuva.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/30506523023.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/zufelusibakojeviketarujim.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/libuzimewozori.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/86436471978.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/69fa3c1a6643f1f47a94ffdf58304807/mivevixajezaxavuwasiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2021+mothers+dayPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FC 18652 bytes
SHA-256: 2e3b922c5f44b92de5c4bb395592f4cf8e42214e7e2a45feaeb02e12308903f6
font_01_sfnt_off0001328c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328C 10580 bytes
SHA-256: d7728f9941093c8fc52d4167ee2d9766a1faf234dc7e2e3e2b9cc7dab12728c2

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