Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11d13f1090bbb52…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 12:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85a28da6d4f9ca15def7b70f859f2115 SHA-1: 95548ce74de2b87a4cf48bb448898a8b0548535e SHA-256: d11d13f1090bbb52de73efce7c7339e3822f3fc69a435f9ac80a309c44187086
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://beijinghuojia.cn/userfiles/file/97958396393.pdf In PDF document text
    • https://advik.net/userfiles/file/tajarol.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/55bfiae5h3vmbepdpvq2slk7gn/23392423659.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f2149688---timubosimuterugi.pdfIn PDF document text
    • https://la-klamm.org/Files/files/35292689784.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/49227639232.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac8f15425---56930398450.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/10cf5a587fa944cf36a118c6a960d2fb/23545381831.pdfIn PDF document text
    • https://basisnomor.com/contents//files/51401803986.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/31f9963bfcb24244fd86ba202043c324/81488862096.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/wumilebodiwevejok.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/sm6bv75u53i6tguanoq6odsf53/4014140066.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/todimosilirunizemezokisal.pdfIn PDF document text
    • http://huntland.hu/upload/file/xefutilujesutotadolel.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608817c009ded---8976122327.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/mapomunesufitukidenedivox.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/6420043422.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336b546ae9f---36420027070.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98864d753---3008080953.pdfIn PDF document text
    • http://midel.me/userfiles/file/xolapoduku.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/likolikudesorenowuwol.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/63ce874e5fbdadaad294c2d7d16abdcd/89905799195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hot+zone+textbook+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 18296 bytes
SHA-256: 80b1929476bc9f78da9b1e84478e654cb843636ec88d046992c537f930d60916
font_02_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 10308 bytes
SHA-256: b627bd6c4caab370e7757e718eac8161c2357daa6e3a424fd0814752b20030ff

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