Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc074b39e277fdf…

MALICIOUS

PDF

73.9 KB Created: 2021-09-09 07:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: e48e4390e8acd0b4fcebf3d50bc83661 SHA-1: 4cd20ffe2d06ca2ececf651bd2d6dfe55b273a2a SHA-256: 1bc074b39e277fdf57affac8d43391cd5f0e77a9044f6a2d439e9a78c5487f70
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 by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cansuyu.org/resimler/files/85103231989.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161328b334bc49---10161116750.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161361d3152c0d---3356898971.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/salerogudenob.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/15031667969.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/1789994427.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/taginudakisirat.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/renegekegadad.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/moxagenov.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/8124430910.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/sikawit.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/dff0b56a794c746b8d311bdb26db32b3/miboki.pdfIn PDF document text
    • https://swiz.eu/files/editor/34608764109.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/rawozivinijigigukawixitem.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/90dec04a94d2d5d647f596a5368e09db/dexagasufesere.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/78495160513.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/xotubopakexemipoj.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/52199100727.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2109090851173968137dvu3.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/73933875026.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/winufojogapurukisuwibo.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/40044617861.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139923ea6946---56014317291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cara+extract+file+7z+di+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_off0000bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 10544 bytes
SHA-256: 102303c5d93b6fd1a4539f4557b6149802f8b3dc1ab36e6ab50e72f9800fe87b
font_01_sfnt_off0000d83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 16088 bytes
SHA-256: dc4697f6199e5158d9310ddaf73c6c356a91328d15680f7229f9faf7e8f368f4