Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f197cdaefd3c2ff…

MALICIOUS

PDF

92.2 KB Created: 2021-07-15 22:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1116a3c81b8a829702c26965a840b1f4 SHA-1: 51d4b031bc9040df57c1bda0d8d298c5ac44ca3f SHA-256: 7f197cdaefd3c2ff46c15c0f9b8ebe857aacd89f317ab2c65e43611b13b0a03a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://abnicum.com/files/file/99052680835.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24186a9926---nuvutajeviponobaxijetit.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607737ca431d2---voxojomuxogol.pdf
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/48387257616.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775e4c0f99a---busasibulujulazop.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0c8bc1566e034503fedef1fe63a7955e/nomulunifamujesukigizu.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8ab0b206---31262300290.pdf
    • https://habibitours.org/ckfinder/userfiles/files/femofemu.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cbc51626---30889778104.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9f567fdc970ae2edf4a5d2064a9fbe5a/veraxupob.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2cf1f9b9---mufifisowopu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e122dc07bd---41003820514.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4aa4946b1757591ecfc3a29416b91493/29284571870.pdf
    • https://villatoscana-pi.it/userfiles/file/berovunegoxevotejuzojanas.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/zirivasen.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e33ded92a4---40245643237.pdf
    • http://moonlightmontessori.com/upload/files/99171920116.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafae8a9aa---50988184282.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa19c91ccc---rivuxufavitexejedi.pdf
    • http://artdealer.vn/upload/fckimagesfile/1e3b1fcd4d2570cac67b122d23b0e0de.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a57368077---sojiguwoxunadubemogumolo.pdf
    • http://tksvolga.ru/userfiles/file/90039985585.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/49692906817.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5d3640714f9d948e4c2317e04ec1be2d/4338032738.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=songs+for+music+class+elementary
    • 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_off000103f0.bin
ea51eef5897402c60b36bfbf0718b7292a7bdbc9910eb354166395c8084797d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 10968 bytes
font_01_sfnt_off00011d74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 16792 bytes
font_02_sfnt_off00013586.bin
630b2a2c0dafcbbef6d557e1ab4e709dd2f9a96b5c749e79718fa0ea8efdfba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 17568 bytes

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