Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b17842b14fd7155…

MALICIOUS

PDF

84.9 KB Created: 2021-07-08 07:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df391ed1ea67da5dba693955eaf2b0f7 SHA-1: 21e0b761a3747ae0dadd6648b1e0a6d5ad223688 SHA-256: 9b17842b14fd7155db5f3e849f9954944daa2c241b4903856f0fb7e83e71fa1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing content. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

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://bronia.org/userfiles/file/48138588526.pdf In PDF document text
    • https://volnynaklad.cz/data/file/zajosepa.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jazilonigosidibiforituw.pdfIn PDF document text
    • http://hasyo.net/files/file/34191957558.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafa0e6ac3---35139990897.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/29394639757.pdfIn PDF document text
    • http://cga82.com/admin/File/59607254963.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9e68791af0b52125d14b21a458f1091f/gupimuxuvawasezofajajida.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081b103bd402---85709485711.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/75670963740.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/eb7601f964f8cb24a57c9f89d5e92710/56306474197.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/5be687e44dc7e3a8d2d23eed7f1f7f14/18892714792.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/fff650f5e8d3c0ec08a4e9795901935f/23831421250.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/871d1a28a6078ced7070272a99d623f2/fuzis.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f22736bc5---61381093272.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f603bb4e65---20928686306.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/31376644795.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/51828567298.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/dozesuzikowulezafisutiseg.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/3fjits9mtndahdv720m3lgunss/kusatafewanowovixalenirip.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jumngnhg4m2nsrpgmp78voag5/vawotezuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fce+listening+with+answersPDF 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_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 10452 bytes
SHA-256: 5cc18c45bb8c46d402a8d514a77d45a9ce0b8a1a053b2955cc946b8b7980e732
font_01_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 17988 bytes
SHA-256: 4979d36d75afdbe8c7293ee102aac3296985ff759474be7451eda4ebef07e0b0
font_02_sfnt_off00012e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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