Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a46cd367ae3bc9…

MALICIOUS

PDF

181.2 KB Created: 2021-07-04 03:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0225069c7f98ac1b13110d46ae77c604 SHA-1: 68974641b898fb76720a83b492b1bb15384c774d SHA-256: 10a46cd367ae3bc92b5919d842b19963ba8c55d8d32ba3f74784cbaa977c7d6c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' and 'super-forms' plugin upload directories. These links are likely used to host malicious content or redirect users to phishing pages. The presence of a link farm and the use of compromised legitimate sites suggest an attempt to disguise malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086375e6c477---turewigomawubiwewezaxa.pdf In PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501194309147.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d2b820349534ada331adea62aa1e34d4/99555205327.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c129ae0d24d---85267307963.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/f0dfec04999b61645d26c2f193f31a94/ruxaposafevuvodigom.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/vofubepajumolifewawopo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac90a6ddce0---vuridejenelizu.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/tusafamofedudepudawozax.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0dfcf19f---64204011711.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/banezirekasom.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/50716719484.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210618_275F5AB0085115C6.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/l7r3sksgi3giu22fsi46lpgns2/jexaboleziliwopipedukifal.pdfIn PDF document text
    • http://markone-tools.com/upload/files/51444257450.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215718131443.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/f6cad065b884fbe09797f973bfc4e291/16539546364.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/34460884674.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6d332d8ae48453f47f25e39446fc2c46/49896244079.pdfIn PDF document text
    • http://henca.com/files/details/file/dagofeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=above+all+lyrics+and+chords+key+of+dPDF 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_off00026557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26557 10868 bytes
SHA-256: 496596a1a7c8f2b56f4dd8a304eeaf74e4eeb41ba84b6b5295d294c3527a5211
font_01_sfnt_off00027e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002967c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2967C 19124 bytes
SHA-256: b55c5cb9b1fd5902b5fbb1673acec21f3375793dfea23876e24f52ba512aa30e

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