Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccae1e6e2913435f…

MALICIOUS

PDF

124.8 KB Created: 2021-06-25 13:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3244869d10b6c6f757e21b58e817cac SHA-1: 35ca3021c8b08d072e6c30878922457448b6df48 SHA-256: ccae1e6e2913435f7de4b787925a5da88e5bb5df69ef8632e9e1832a4534f9e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly identify its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://businessvaluationapp.com//fck_files/file/kenotodimazolut.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/76042685763.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/67acf68de194816307d426a7dafc18b8/disujotawelinitujid.pdf
    • http://kadh.kr/bobod/upload/file/romiredewejugi.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8r1tokcsall5vhi6mlaqj85qs3/kakozabinofofujuzojobe.pdf
    • http://wooshin.kr/uploaded/file/126694565460a801d8bf898.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160741665f3952---1038943312.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/f4e8e6213ab8cfe8e4ac3b74fb605729/miberitalamesuniruzelug.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6edda9ab---pomalidanurupud.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6rc4tkbmgjj3k7va69ibfc4qu3/86337963892.pdf
    • http://keacg.com/upload/files/92355127091.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d31ae2b877---papogigitabuzorugi.pdf
    • https://samtee.com/admin/images/file/976535141.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=viroids+and+prions+are+alike+in+that+both+are+infectious
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774c9b5c2a9---75560051156.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_off0001825f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1825F 16792 bytes
font_01_sfnt_off00019a76.bin
8cb0ac93adc69cb50d86d30d0a3c9259a3f1deb1af685acdedec0497a98c2b47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19A76 11020 bytes
font_02_sfnt_off0001b3cb.bin
b03780c9bf4a85a2017f69ad321def4a6e0cd53c2760fdbb2bed98fa79b79d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3CB 19104 bytes

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