Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b88a23ae27f38ca…

MALICIOUS

PDF

68.1 KB Created: 2021-09-05 15:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e31fc3cbfbae3276e95fc112be3c1fa1 SHA-1: b8291cac7b42026216cd6abd05b4b98076781516 SHA-256: 2b88a23ae27f38caa6f208c906a52ce30015b073c513f5ac6a1634a9077a4429
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an effort to obscure the final destination and potentially improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e0ceb060---fajonoxe.pdf In PDF document text
    • http://smelawservice.com/file_media/file_image/file/pavotujovugefisatiz.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/lonibu.pdfIn PDF document text
    • http://ha-sine.com/d/files/68598478376.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/visuxogozulepigoje.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/36240680248.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/sekopajukovaf.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/6782658878.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107544c5f702---24665604941.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/buwoxigeko.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/414ec4810d887fa5617a42f21fc98bec/lozutatugobejara.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c75a68699d5---tixufexadafaxigugefuju.pdfIn PDF document text
    • http://makaroma.fr/upload/file/besolewemu.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/valebimokaroloxoramiw.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/44516892203.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160730323152ae---81584274433.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/vabedalawesonipe.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/25303005227.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/kokeba.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7cf7e394ee98af41b2a495544cfe7c8b/18542404633.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/25193672081.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/kelataresaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mppt+charge+controller+pdfPDF 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_off0000afcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCF 14140 bytes
SHA-256: ceede205a02234e2fc5fc1c7e03e0992c65b827d31bfae8ea3bd466fabc30ba7
font_01_sfnt_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10632 bytes
SHA-256: 09a3acbd663663826646705c9287f22df42657530d4e4c07e6e962da8b15d06d