Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a0efefda4be3a6…

MALICIOUS

PDF

91.4 KB Created: 2021-06-30 11:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ebfa074dcde66d9d497c973417fda2d SHA-1: 2870f49800939feee4a4a0c2612702073a3ae76d SHA-256: c6a0efefda4be3a63486f1f5743752d1be8ddaff89d8d3b72c772f8f23a3094e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://condominiovillage.com/userfiles/file/nomipetoxuvepamekifagaze.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/18bde2d842996c2959c1e839679e7c2f/subik.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab7e600bf---31137315464.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805ab28ca---palorim.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086f0f386589---riraza.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/c72b7510cd4dfa3853f3a444a8768774/36650977727.pdf
    • https://amursvoidom.ru/media/files/risubapagi.pdf
    • http://apsons.eu/files/file/tulemuninexo.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2e87df4d70e94c9dd2a05ae629c7fa10/7896871951.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/pagewabiburudezega.pdf
    • http://auxerretv.com/content/public/file/siwifigiromopimisi.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d8d58be51543f183d7cd06564c29c599/4018706595.pdf
    • https://gregor-biffiger.ch/userfiles/file/47197032228.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc349c3e45---voziduxedupuwegomoxuloza.pdf
    • http://bbfederico2.net/userfiles/file/todezesabizozuxevigudase.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/7297a6ffd80bde7920f58fb7da237e85/47470410401.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5b3060f0b---fatomuka.pdf
    • http://decamiones.com/userfiles/file/mekaritexupedatem.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a065aea11d7---42653010664.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/3ccp1boss70dsalkq9nfdtpjh3/fidovugejebije.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9c0f5e5e21954fc6674a4b614f93afd7/71856700242.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160967b80ead6d---25691726029.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a2f12864---pusababupageda.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/bizifaruxadukazu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=image+to+scanned+pdf+converter
    • 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_off0000eabb.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 16144 bytes
font_01_sfnt_off0001003b.bin
9745525d74617d45261dc4dcee1dd25da2848d0c0f98b945ccbf997f16da37af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 10840 bytes
font_02_sfnt_off00011915.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 16792 bytes
font_03_sfnt_off00013127.bin
eb7ed4b06589f097fe5a837da0edab443a9a4b9cc38898a6aeee9c9b26bf281f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13127 17888 bytes

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