Malicious PDF — malware analysis report

Static analysis result for SHA-256 257699707a393dd3…

MALICIOUS

PDF

73.4 KB Created: 2021-06-18 21:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0594e37ead197c516a8f8df6beabd00c SHA-1: 10b63096f077d3a58f468ff1f77b92d52685d703 SHA-256: 257699707a393dd333a05e39bcacbc2df9faa0af24f51127295dc098708a0c48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'removing watermarks', which is likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vtmt3ejejhe3do5pl82nmh7t44/gifavixapi.pdf
    • https://allcreaturesinc.com/files/files/xumufuzaxidorakakos.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077706cc16d2---fosipebanewodesus.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/34205705471.pdf
    • http://flightshop.jp/images/blog//file/10704666126.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607669a2ac5e8---30428442915.pdf
    • http://narnivet.com/userfiles/files/97416557146.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608eba2c16ad0---72241083836.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/0b9ae65970cf263892ca149eee563c35/wodaweg.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/a9sd5qpacv8o073p7s4qtqg91o/kosigabopumudaviziwimidet.pdf
    • https://dolmalatrek.com/userfiles/file/14383947242.pdf
    • http://robalton.es/Albums/images/file/%5C/12931327607.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0d040d96609bbcdfe5a066b856a10e84/46854039707.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160743c9e9567f---97751367519.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2dce4a0a0897f210afd51999d9251a46/nudijitive.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+remove+watermark+in+camscanner
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d233.bin
b7fa74489021d4e498da3229ae1b6bd4055491321a3e5a691ced6b1f57c9f88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 4880 bytes
font_01_sfnt_off0000e2b1.bin
e8d4547b4268fd87b76b6a8b6122a427e7a277391d0f8e137c6166d211261f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 11684 bytes
font_02_sfnt_off00010a6c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 4324 bytes

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