Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeba11f17b8cf9cc…

MALICIOUS

PDF

77.3 KB Created: 2021-09-15 19:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 676a60c649e36046d47bcfe5b7b9776e SHA-1: 90e72a4bfa7c6ea24e02e41f0c5f4431084a5a18 SHA-256: eeba11f17b8cf9cc507f69bd93de300a345d2a417090860fdac440fa77fa58c2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document's structure and URL patterns align with common tactics for luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=mute+text+messages+android PDF link annotation
    • http://elfast.ru/userfiles/file/65247448258.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613238277bc38---dolodepiladesezi.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3afbd57c91023dde4ae9b08373114661/42721380784.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/79083524791.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/fusatufokaxudujeliwosu.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/buxaluzokebonotejave.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/gojuninekol.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109072203028153.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/tomemegogamo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1cff2105---zepaxokubev.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/25f8161bfd59f9ae58e47b384147c967/zobojepedikujiwoxo.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/38234566218.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/narejupefovavuzimideseli.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/somarixadepagosumipoliga.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/jerujiniked.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161406557001ff---93487274863.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/96724251312.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/modorepuw.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/gekekorolimite.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b0fe1657e2fa14fba9fed202fb51de0/xazuxovikipumoxokofimakuw.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/7988262115.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f92a33145a---54125023572.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/kijoturijuguvulipizuti.pdfIn PDF document text
    • 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_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 10740 bytes
SHA-256: 036d3bd0e54c46867187745c15dfd6701a9a2069007672d040f7b7844f3522b6
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 17812 bytes
SHA-256: 91e5610ad702eace4abdd10c831c7e16b0b23bf4d2c96ee7480d8584b747f01a
font_02_sfnt_off00010fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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