Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc92011c5c1a58bb…

MALICIOUS

PDF

88.2 KB Created: 2021-08-22 06:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68cfdb4298698211a7d4f74146cf7f23 SHA-1: 2eb319d3169c8a78872b0d5fb02f693394fb738c SHA-256: fc92011c5c1a58bb5ae5d34d708ce29c9c0b4af0d027b121cc49148fc297102a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple external links strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://growlink.biz/userfiles/file/wepazes.pdf In PDF document text
    • http://hgbs.de/userfiles/file/95772340559.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/30182805018.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fefbc12ff---16547305119.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/mebuxilokoka.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/ferofadavifirukasan.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a5a181ed9d8b584e63b161f2e827771e/98498754120.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67f3d3b48b---42558343053.pdfIn PDF document text
    • http://nenorm.com/files/files/19221231222.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fcb909dad---foxeseromakifi.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/cc3f36bd42ae546a5db9be9fa0a2687a/44218791155.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///dukuvelebenodadu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d75195764e1dfe4bf1da37c9c0825c65/68068551783.pdfIn PDF document text
    • https://guijek.com/userfiles/file/90373013182.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/55443762439.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/4005994640.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8c07d49f20fad39b78681588b7307692/84796687125.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gapezogumar.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/nademimokapazu.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/58209198002.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/3553188885.pdfIn PDF document text
    • http://bakoca.hu/files/file/65729642163.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/27962518474.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/46612157869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=just+listen+mark+goulston+pdf+freePDF 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_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 17844 bytes
SHA-256: af99dc5a853a4cd9860a84520d96c4d3252004dad81b2f6a6ccd42f122a63085
font_01_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 11024 bytes
SHA-256: 0b29258cf7ed7268508e57125cc18b38fe452c1a7dce2bdbebc99108b9a95611
font_02_sfnt_off00013a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1