Malicious PDF — malware analysis report

Static analysis result for SHA-256 f099ec95b304f357…

MALICIOUS

PDF

89.7 KB Created: 2021-08-13 14:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f7e957d5190eae7a34bcf8bd3be052c SHA-1: 73f34a6348fc5447088727fc74703968fdc080d3 SHA-256: f099ec95b304f357622a747a110b8bb6c7b81cf25167988b811f945770256555
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://huntic.ru/uplcv?utm_term=live+wallpaper+free+download+for+android+mobile+phone PDF link annotation
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea7a1e9ac71e4fa0e724a0f80246b6cd/24293012957.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/gesaloviwarowem.pdfIn PDF document text
    • http://samromschool.com/UserFiles/file/bakukipoba.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868fba1cf59---77022499668.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/watatawajinixaf.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/11075777713.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24850bf85---57447884508.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3dd48d5f---lebosujibezujumipi.pdfIn PDF document text
    • https://togeltop.net/contents//files/95063918940.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d991f99e31---mipozutokokutef.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160de3e040898f---najuxomoduladujabimusib.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/xutigaregobotivave.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2a55e0408a4ea8ec21ae2cd91637e1fc/41123730836.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/bimikifogulozekezutidiw.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/wojepefaja.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/nelulutefe.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ddd13f023e21825f4eae9a13cfc33371/86609626819.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/59803082512.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/8160368190.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160712b3212963---93602361312.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf3c019b13---mevamoz.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/069993fd5a5672df0ad012b67cf3e509/gixipo.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/16787328089.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6013e24c47---tojivemanatebilufovuvaxu.pdfIn PDF document text
    • http://getem.pl/files/file/medop.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_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 17052 bytes
SHA-256: 1633fd32645dc5dc96f54a17e6298378054c46e65d3c5fb563e8805d1e6bb148
font_02_sfnt_off00013f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F86 10748 bytes
SHA-256: 97eaa157b33d2dba98484b76a73e185f93fedaebfb27638b0d9ddcabc9ef5bce

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