Malicious PDF — malware analysis report

Static analysis result for SHA-256 8036e04e5477a678…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 14:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d68c10412c5cf1c18a635cfa4368592 SHA-1: 3481bcaf9c06d0029bc32cb18f80bb29a49e334e SHA-256: 8036e04e5477a678ba6572f114c9838bbdd329897ff7682d96967fa878aab1b2
156 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, which in turn host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure implies a redirection chain designed to obscure the final malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c776b74e---finoxuvevorolilazojo.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7635917e7f58185e16e08d47a0ca0d0b/26338940641.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bd8jsinjfa2e2se0r84r689gfo/velolajul.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/fd0cb7087fabf3be2e28399766f3b304/ruvivakituronomatebuwakap.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607996329c38b---39672477540.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6dff302f8---17370508701.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a4cdbd425ffd060467a7020b63d0a8af/lowavisoninukeri.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071592750b19---44226715055.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b89856d2---15984957640.pdf
    • http://supermarketdv.ru/files/file/reguzediwofakibuvirobi.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d4d1c60d---61786173056.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954b165a239---zaguzetomax.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/88803118807.pdf
    • http://sugarfree-gelato.com/upload/file/bijokaporudedofotaxi.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0l4hjp88ph0g5ijg2l2ged7bam/razugumizolivexaloguduzek.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/pefewejutimes.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b2b027e3741c30ff99f5e5604c12e0d9/xafusevew.pdf
    • http://abacusnancy.com/userfiles/file/xijar.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/894d88fb437ac6f95ebd1638c2c8817a/bojubugibafep.pdf
    • http://retroldn.com/userfiles/file/jamiloromefujova.pdf
    • http://a-kamen.com/userfiles/file/46381937352.pdf
    • https://allcreaturesinc.com/files/files/44138542745.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1f190127---81552923277.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909a7542735---63571493814.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879bb6999fc---78979129092.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e16a31b67ee9c5c4a0fff230eef481f4/67436156578.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+change+metronome+speed+in+garageband
    • 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_off0000f3a1.bin
a90c2bfb364868b8ffc8757ebd10f2adfe34d4a32405c2b8beff6ceb6036e704		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 16852 bytes
font_01_sfnt_off00011fb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 16792 bytes
font_02_sfnt_off000137d0.bin
bc26373cb1189c17735e4d385057d9758414f313c29ef06a1594a050fcb03b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137D0 11132 bytes

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