Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ee2781c32e94ad…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 09:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddd4dccb242a2ca22bc60ffb027609ed SHA-1: ac49d2d1781168a4a462fee8d3945214ed51cdd2 SHA-256: b5ee2781c32e94adbd267f84691cbc8d595bfc02f85fef48686dde644dbf57c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised CMS upload storage and disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, such as the one found in the document body, which are designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://coretry.ru/uplcv?utm_term=munthiri+padam+mp3+free+download+kuttyweb
    • http://belloverde.net/emailer/file/25519898336.pdf
    • http://drzwiukryte.pl/userfiles/file/97191204834.pdf
    • http://gu-bo.cn/uploads/files/92878615566.pdf
    • http://cameranichietsu.com/luutru/files/devafifajarozofij.pdf
    • http://lubrifianti-auto.ro/files/file/kunoxubara.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/sesemapuwuxenezagexux.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a188fb62bc3225c0f8dc59f1a5437779/bulirematuresilukukep.pdf
    • https://ptogel2.com/contents/files/35556107264.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/forodexitoxapanepub.pdf
    • https://perfecthospital.net/FCKeditor/file/tiguwivibamuwubugufuru.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb4062417---34997480620.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614577babd649---56980405824.pdf
    • http://tootingtaxi.com/survey/userfiles/files/43557440076.pdf
    • https://alansglobalservices.com/ckfinder/userfiles/files/83419871755.pdf
    • http://ampletrekking.com/userfiles/file/banisaripevawatusekakowat.pdf
    • http://autosoftware.company/autoresponders_images/files/pixumetina.pdf
    • http://blekinge.boj.se/uploads/userfiles/files/98394533791.pdf
    • https://hagabb.ro/ckfinder/userfiles/files/35602241511.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/5775559166.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e27602581a103ea22a12d197a20f347e/35471148659.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/46608449042.pdf
    • http://wangguanhardware.com/userfiles/file/meniwewapowukodazoliro.pdf
    • http://guss-ex.de/uploads/fck/file/85642554637.pdf
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/lizewigaremobubanawejidaf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baa6.bin
5fff00743cbca99111c2a7ac28d1b3d5d8f2da3a717fbbef75202c4a137a6772
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA6 1760 bytes
font_01_sfnt_off0000c2f2.bin
3a305fa52f0100a87847cb28a85fda770478a0e248ceaf8da44e61e2ccac4287
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 11292 bytes
font_02_sfnt_off0000dd1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 16792 bytes
font_03_sfnt_off0000f52d.bin
b1bde05ea20b22ecc6c650209c773e2ca71337cf87d5deb8f609f1b872f6b29a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 18368 bytes