Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8ad4d72fc5acae…

MALICIOUS

PDF

92.0 KB Created: 2021-07-25 00:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6889b592dbb5415fba18c704edefc0ca SHA-1: 9adae0a1694412ea63b83159ff5a1333773cb5a6 SHA-256: 5a8ad4d72fc5acae0f40a05246a608a50ca4baaeb4ee93dd29c63b8961ce9abd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 7

  • 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.
  • 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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4323d220---danitogajifodaragi.pdf
    • http://opusincertum.it/userfiles/files/likisesafexulenomugozige.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c98280e8ad9---pozemumepowuso.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/984292fd8c11919f527c653fe1fd92cd/regixudar.pdf
    • http://dieta-plus.pl/userfiles/file/buvogibefe.pdf
    • http://cl-metalparts.com/d/files/molarikuluvuluzukiz.pdf
    • https://kanalprofi.at/UserFiles/file/xixusetaramerizedagu.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dc506b089baa78dd6224de980ddf6118/93827166833.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/zogisijodozenavujarem.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/mowidosojifizijuned.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/13f157efc50c04edc5c536d69c234070/nixeponowibirafufimat.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/kowuxewi.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b077ab71d1f---pekevefo.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8fa6bc637---43969356516.pdf
    • https://ckmandarin.com/uploads/xubaju.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5917131539---93184024357.pdf
    • http://sambometal.com/dataroom/file/wolezarage.pdf
    • http://cucthongke.vn/userfiles/file///vojigekikuvebupedaribad.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/62758564413.pdf
    • http://hopkinshigh1988.com/clients/75739/File/wixarexukuxaz.pdf
    • http://birnagarcollege.in/userfiles/file/buniwuberi.pdf
    • https://tonwen.org/userfiles/file/60897745240.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1dd923a093---31070837603.pdf
    • http://karat-dobremiasto.pl/userfiles/file/3783634913.pdf
    • https://kuni.ro/app/webroot/files/userfiles/files/bunutim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=best+way+to+grow+your+own+strawberries
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e7dd5d456378f6995b8b61f64f0268f9/nosixikotekazujexud.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/94905277247.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_off00010461.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 16792 bytes
font_01_sfnt_off00011c73.bin
12f17108a67e602ffebce759cce49aab8a3b28e0f19d8aad984266cea661e5b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 16960 bytes
font_02_sfnt_off000148a9.bin
2577050948a9301dedab42653269aa22aa7d8616e4742d0d95632ed4044c0e65
pdf-font-stream PDF embedded font (sfnt) at offset 0x148A9 10732 bytes