Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9f9dbc4e34196b…

MALICIOUS

PDF

88.8 KB Created: 2021-09-06 00:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09058df5da83b0769adca9955f0a6a5e SHA-1: 1dcc592c3acdf3ec1bb8c5253c18675d657de44b SHA-256: 4c9f9dbc4e34196b000a8281f8f657a6070d941273bab5187ce524e36534cdaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains multiple heuristics indicating it's part of a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous external URIs and link farms indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ivanamihic.com//files/lasutef.pdf In PDF document text
    • http://sns-russia.ru/userfiles/file/zelijudefe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a53446c63c0---mutesitaxadakexuga.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/rugijosaroravewafeju.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/bivet.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/jowijogigedezuxaretuwoj.pdfIn PDF document text
    • http://iccarrentals.com/files/file/64293733647.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/wijadazudalufuno.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/43134265459.pdfIn PDF document text
    • https://webmenuplus.com/images/file/nomirizemiwowipelufat.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/wapajaf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160871dba66bd4---lelakitefig.pdfIn PDF document text
    • https://soltendance.com/stockages/files/fisutewuvatanuxewogopa.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/bezozalowarulube.pdfIn PDF document text
    • https://abeess.com/userfiles/file/43156890780.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/37400284734.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mibewubilijuvajigotuxo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e56a6e68e962e6a0df954000a5390c6b/71436468368.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/i8q625ikf76s0ineq30nv9bt8m/14878969791.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/18342036264.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a1c56cb6---nakababewadalaletute.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/fexozubotutoje.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/tekovilerumofa.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/gabexugojaruzu.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/tazop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lectura+de+etiquetas+nutricionales+mexico+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_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 19816 bytes
SHA-256: 4a50850324e1ec836558bbe1a75370096acb08ac754afa29f7855f5516e800e9
font_01_sfnt_off0001239c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239C 11088 bytes
SHA-256: 6b1de1a8892a55abcbe3c02e3bba330b8ab77edf904e8465b9f9efd1d2f2f8ab
font_02_sfnt_off00013d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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