Malicious PDF — malware analysis report

Static analysis result for SHA-256 794076cb77baa415…

MALICIOUS

PDF

89.5 KB Created: 2021-09-06 17:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf3a8fa1ca3d615182a3195a60aa3ccb SHA-1: 5654677f0ced73c717c2b88b777be6255fa3da66 SHA-256: 794076cb77baa4156fea2421ba1064a45275d79c8328bdfa6c2cd2a9d59dbaee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://semineebrasov.ro/printuri-fi/files/jodopupumixuwubulif.pdf In PDF document text
    • http://libron.pl/fckupload/assets/file/lubetor.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7aec88106---80157374140.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c1e3afe30---zubunenura.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d662297418---pigedipere.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/eed9bd66b8cdc3e74bc5324f05b51881/dibavodebifefogefe.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b4b66e93ebfb5612a84235cb70ba3a4f/16739220761.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21989673f---57786373353.pdfIn PDF document text
    • https://kede.org/userfiles/file/42308182450.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/80032546131.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/jakajigod.pdfIn PDF document text
    • https://hse.tw/upload/file/43954633124.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c29c479a54a36fa9c5b456ed90e0309a/1045837337.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/0r5v59n4uci6frf741jssviit3/49664718976.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8d39ac8e---31038594050.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/fifubub.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/16920976270.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/gebek.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/387838019.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/22d7a3d531a6fb7f41cf878ab7dbcbf0/53686010803.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/rezidupepaniwesifubejepuv.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/25998710894.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/kiwigakixofife.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/buderunagenopenelinevunix.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/bixufetidesobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=libro+de+ingles+basico+con+pronunciacion+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_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 20108 bytes
SHA-256: 31f37dfb6b11b86d34bdf6c8bb178ba9390e4af03a9e2bd967dd8fa581756e1c
font_02_sfnt_off00013ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 10896 bytes
SHA-256: bca613d80aef1fe29f014051e90a2b8ea8cad34c8a8658c849da74799638c1ce

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