Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e82935ac5732071…

MALICIOUS

PDF

200.0 KB Created: 2021-07-01 11:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6301242ef5a3ee162dffaf1723f4a8a8 SHA-1: 9eddd97c0ec9242343bbea207737c5df69dbebfd SHA-256: 5e82935ac573207107d5787e1bd1f652160b3c4fcc85656f2773c6dfff7e1a88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the presence of numerous external links on compromised infrastructure is a high-confidence indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

Heuristics 5

  • 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.
  • 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://geluidsadviesnederland.nl/ckfinder/userfiles/files/44895411816.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f490210aff---60733553550.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/23555137589.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a5c628890---20154800825.pdf
    • http://omonetach.pl/foto/ilustracje/file/xibewozupijekuva.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7b3369c3---70351826920.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a81b0c317938eebc1904a6d144f14496/zezojujidijojipowawow.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608593083dd0c---kimodibipepegoke.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb19a44fdab---togonevegimu.pdf
    • https://tedvandergulik.nl/userimages/file/nobowofasukiwaze.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/7656340838.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d56cea1c4---luvixurajidu.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1d280221---dowiketuk.pdf
    • http://www.aportecnica.com/imagenes/editor/file/66994112924.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2d3smnhagublnhkqs3ec28j21o/97198417545.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/drr7et6r8to9k0qi5fih24o0fg/21271845656.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/bcdd48901fd8895027959c671fc19ede/53532110562.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fvfbvoiu6da3sfg0dnht17i39/42799469207.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c6caa313a06---39264359631.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f759ca0f1c---punuzanivuropevubetexoka.pdf
    • https://flardochform.se/userfiles/file/filumibanaroziro.pdf
    • http://reicar.dk/userfiles/file/subitelanomif.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491b4dbb28---1540901447.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/36gukv43cs39kl52lt18qgmgc2/77909079099.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+instrument+that+measures+wind+speed
    • 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_off0002b2e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2B2E4 16792 bytes
font_01_sfnt_off0002cafb.bin
14f036e493c4aa6ceb1a95bbf2cc9e4d13438faa08a83b4d4a88e3254bcbf760
pdf-font-stream PDF embedded font (sfnt) at offset 0x2CAFB 10640 bytes
font_02_sfnt_off0002e331.bin
ac1d73365c324b483196ba47b69e4566491c170754ab74d7c7d4224b89bf6cfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x2E331 18392 bytes