Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf30b54d05e7d43…

MALICIOUS

PDF

88.4 KB Created: 2021-07-01 15:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d8b690fcd372f5b0e26742e89f10985 SHA-1: 7ff1bb660881f6aac6bc72d5ac5e40afe982e67c SHA-256: 6bf30b54d05e7d439eb2c5a86eed4a3fb39e965f0f721c95a6016a8b8371ced8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farms indicates a likely intent to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d410d357cf9---98047307109.pdf In PDF document text
    • https://amd-export.com/site/upload/file/58361900249.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/rudigogeguxuzav.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/42471788821.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60975167944.pdfIn PDF document text
    • http://teraval.cz/res/file/94426406198.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/firozoviwagelajamevimuzo.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/xezom.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0a8f6d7185dcf9fcb4673a23c37d0b83/zilelanu.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1bb393053ab7f41332f58bc8a80a97c4/51429494563.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/vuzuxotowonafo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/377a9c56b893325689f3afa5a76ec584/xumopoperabipotewusadu.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/57422424988.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/he9viqjo6h3qquk6f7mfsgth90/52611596289.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608591874211a---gakazirupan.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5fb01572481571a2815d042349fceb90/24702077900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dead+or+alive+xtreme+beach+volleyball+ps4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 11176 bytes
SHA-256: b8eee6e1097bbe895314e298749f8e1072f2a2d9e13e78821164916feb8bbe7d
font_01_sfnt_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 30636 bytes
SHA-256: 08fdc56d3131aba3dd4c7d0c41bffcc036b62aa82c6b9e6a463420a05938f4e4
font_03_sfnt_off00013ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46