Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8633a11d4c23ed…

MALICIOUS

PDF

108.6 KB Created: 2021-07-06 04:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bfd42636be516978e306ff4ac0a0c6f SHA-1: 87cf5629c5156a841f20b1367d77db91509a9c6a SHA-256: 5c8633a11d4c23ede2aae4120e0cec1bf083b1a3cec26a0c430a6727bc9fd305
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards an attempt to exploit user interaction via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 6

  • 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
  • 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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/20332c04e80cc77b01e83f478664a56e/28524290397.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607586b4e9b56---38215864865.pdf
    • http://tauzetaques.com/clients/1/1b/1b95303171b4519794d6fee637ef680e/File/xarawiwip.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcf5e5bb82---6554808372.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d57b450454daa17a302026fd546d2b66/33412492508.pdf
    • https://etonbio.com/newsLetters/images/file/70479605071.pdf
    • http://prime-standard.com/piceditor/file/memobiw.pdf
    • https://securityguardsupply.org/php/uploads/file/dopavajexevu.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/766425bcdab085116c9a9a234cffcc22/36014651363.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/694f4e6eeefc2b60e9da8919c3fe4090/99718822188.pdf
    • http://meechoktoolmart.com/user_img/files/lizogaxizapugoko.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/9e636e80173f088fa479cdae1408f18a/96894772365.pdf
    • http://c-six.it/userfiles/files/rusewedudunabukufurudik.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3b73e52d152f8e362610309f4450b76f/47776621943.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42da623cc---84777266726.pdf
    • http://luxe-pools.fr/i/File/18574954563.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lh6rjed9f4toccb2ok5l058ctg/80162486536.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7e716b08a4fc472ed2549bb825f5c00e/banidazalafisetofunog.pdf
    • https://2acontractor.it/images/file/xubuzatufemipinevutup.pdf
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/91812433735.pdf
    • http://aisef.org/uploads/userfiles/file/file/xiripegunedufizunofidex.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ab1fb7f643965d9a5c22368204ecf385/25570368759.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607650cd74b10---2222098408.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1f93e56e2673e5122b27c2f2ca10bf71/28833765124.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/87b395618d5697f10be6cf685f6e2077/romaxuvuzudidepagetam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=alter+table+to+add+column+postgres
    • 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_off000138cc.bin
f6ab9a263a64a37f18f8b35c0f3947aee7b94510095d05ffb893cf728c793f62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138CC 10988 bytes
font_01_sfnt_off000151e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151E6 16792 bytes
font_02_sfnt_off000169f8.bin
1bb911b10934ae6317da0f776bb82cf1d414cd22943637f3d4820842fb81fc37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169F8 23704 bytes

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