Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86ecb88e6dbbcce…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 13:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9c8871d8e3cb80c960ad764691c822f4 SHA-1: 0d93e229020cd6deb2588b41320c1b2eb83347c0 SHA-256: f86ecb88e6dbbccea18b46ff669aac963a187b1603c0dd3327e23b979eb4c33f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing a link farm hosted on disposable domains, designed to trick users into downloading further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown reputation URLs strongly indicate a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://martensmgt.com/business_school/uploads/file/54883726791.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1kr5vo2ajj6lh7g5vmpabcspe3/75682169164.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/xunuvirowemolazezagoduf.pdfIn PDF document text
    • http://sdds.be/userfiles/file/xuripetokomov.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/12683175669.pdfIn PDF document text
    • http://tencanpowder.com/d/files/rijekoduxoxakelupunede.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132c1b19e88b---nosemuzo.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/kapaketukomerewok.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/34115635785.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317b7f25767---jilukutelu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mbr7mg5rahr9sb58jmp8kprl14/nibukokepulizovik.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/xovamoxaxajuzepusovubifib.pdfIn PDF document text
    • https://akconta.com/uploads/files/72401475684.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d03c182f2a---57549893102.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903183445.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/jituxab.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/90395727687.pdfIn PDF document text
    • http://risme.vn/files/90098440199.pdfIn PDF document text
    • http://totoumi.jp/upload/file/tapedukufojonizuwatid.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e33bf041b9---18791956472.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/zamugudo.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/93378691812.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/wudokupegipaxotosanab.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109151801584404.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/dadubagezunajiketa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320a647a9fa---8931537912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=new+super+mario+bros+2+free+download+for+androidPDF 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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 10984 bytes
SHA-256: 73503f5a27fc55a62a3def30710252a74c6d8e2c1b0e74c41b646e2527e5230b
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 17896 bytes
SHA-256: ade773fed460f4aada0105115fa938832f03bf481efba4a0b47c965bc2991fa3
font_02_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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