Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42bbc3b554078d3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 21:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ae26ba85cc284edd86a0ba97906af54 SHA-1: 1b7cc0cdae77e0a42cba79c87cba4aad81283663 SHA-256: b42bbc3b554078d326d1fd7b56640849bb3edc2c29db394e1ec9279fdd1b031b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various websites, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://infrive.ru/uplcv?utm_term=vidmate+2017+app+free+download PDF link annotation
    • http://transporteslaplata.com/imagenes_web/file/gomivopitokik.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161355e8df3c00---gowazamoremam.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/42095856927.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161400c0dcaf00---64989358761.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/felujawesil.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qhe507r20nq679riqfb6dg19l3/46521374245.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/xepukupusufedakizoze.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b40506b39---35386536107.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/82391728203.pdfIn PDF document text
    • https://seerupit.dk/assens/file/tafav.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d58fa078762f9a3b36f24efe77790fac/30942665179.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/logibinuni.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/72102419486.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/37727298484.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/98168761867.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rsk25pt69hlpl00umo4q4ijuh6/nobul.pdfIn PDF document text
    • http://bushurov.ru/images/files/87307162694.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/10057539163.pdfIn PDF document text
    • http://holzweiss.at/99051091643.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ad11fcb3---32193361010.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/dinujatizodasorigebede.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135808f6eb85---92678063259.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/wejogukelejol.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/relozagivibeve.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/74815078247.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/7674855100.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/44263375041.pdfIn PDF document text
    • 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_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 18288 bytes
SHA-256: 8c5a8e73163aff6998185d6b291e167fd397866d3746f2259e6ca83ca4808212
font_01_sfnt_off0001107e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12895 10892 bytes
SHA-256: 513684460bda7427f382f2555919f2c60f2e5f33136b6b442e49f5b7523d30dc

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