Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47068e139a4a5c9…

MALICIOUS

PDF

95.0 KB Created: 2021-07-19 12:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3395d7746614d128e66641d53e9e3248 SHA-1: 60dcb5fa8a619cc5e86921a2bf593a84dfcb9ff5 SHA-256: a47068e139a4a5c91f962e95d6dcebdc25c1239722e2ab939141300751a3fdbf
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links suggests a tactic to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dnepropress.net/files/file/95771493766.pdf In PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ace3e30d6afaba797a0ab71ae2eddd9d/vuxozeladasuxexelijaliwir.pdfIn PDF document text
    • http://yoron.net/up/files/3039261923.pdfIn PDF document text
    • http://c-amc.com/upload/files/zaximafilob.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/dijakanugiwufopasunizepa.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/xuxokonepilanowubogo.pdfIn PDF document text
    • https://stvorki.ru/files/file/kiputije.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/l7husb6ec62n3vls51rm5ghfo3/76122271140.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/33892363844.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b2555425d---30355574926.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/if9nlk193ia8e5g0e3rk4e3fnk/10319028636.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/39596542595.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963741214e3---71526813723.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac163328b6b---setobavoxupaxanesibo.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91a60065c---buliwovopim.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/66900599275.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/pulobotalopanukab.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/98246721007.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed5b50f40---jijifamumovidubobupubiwol.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca1cd08682---bozafuwaguleko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=missed+two+days+of+birth+controlPDF 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_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 10904 bytes
SHA-256: beebd548ef3e01819a5cb809ad85da8ab9aff8a5b50d3d3a0cc1d6110354933e
font_01_sfnt_off00012950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14162 17440 bytes
SHA-256: 0a5c44435f67662d4385c904799d82f359e4256e304374afb5e2d14be0ae41a5