Malicious PDF — malware analysis report

Static analysis result for SHA-256 359d95600aad1063…

MALICIOUS

PDF

72.2 KB Created: 2021-09-12 11:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96f4fc2e06ff02720f5e99da0b23ef6e SHA-1: 5ace8934a9e981292d009e30b1ac76c8880fb02c SHA-256: 359d95600aad1063586a81291d8a65663a43aadb086bd5dc2ba42039c3f01481
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm suggests an attempt to lure users to malicious content or exploit search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/g8nu1tsmtmf29e2hk7h8v6qld4/62442789698.pdf In PDF document text
    • https://manhalhealing.com/userfiles/file/bewixupelezosipur.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/kakule.pdfIn PDF document text
    • https://hoalavender.net/upload/files/jowobapoto.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f1e2f6a45791432909bd5d5a6339fc24/38298729904.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/83828785110.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/87109ea2cc46c36f019475a6751409d3/73903165283.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/13931648867.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa9a2d3a2---mapakoporosejikedadew.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/90162475992.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/171388552.pdfIn PDF document text
    • http://geraldinekilkelly.ie/zazop.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/vuvetaxonomuropufabi.pdfIn PDF document text
    • https://promise-land.com/upload/file/56389574585.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/25364681155.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/wonuf.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/5155493686.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/89215897326.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161377382499fb---kezenekejekesawanan.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138472057ad6---65379331150.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/93772894160.pdfIn PDF document text
    • http://webbuilders.com/files/file/53557718766.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da78b9d6bf---74969583556.pdfIn PDF document text
    • http://analhospital.net/file/files/xudumekasexagalupame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=take+image+from+camera+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_off0000b8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DB 16448 bytes
SHA-256: 5710f673a6d5c69c5fb553646e34790a46101412fb243a73ba56397b2b7c815a
font_01_sfnt_off0000e3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 10560 bytes
SHA-256: 2ddeb4ef1daf0d45f91b8b57278d17086283dedb8088612f6feaadaf414f596e
font_02_sfnt_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1