Malicious PDF — malware analysis report

Static analysis result for SHA-256 c099cabce726b519…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 02:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62e7b79e09785ffbc4654a3ec167aa3b SHA-1: 5e555386927f87a45f374e26fa58b6864ea18705 SHA-256: c099cabce726b519b5868307182caaf930688450ba9a439e186d3a6ef7e9fdfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

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 https://narimasu-chintai.net/jcfiles/file/89226083223.pdf In PDF document text
    • https://tsolisp.com/files/file/vasuvapaviwavatul.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2de37844---73345255329.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096b58297523---jofipofemexoduludosuze.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/bolezofibasinoxisep.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/17032241674.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/nadinesejuteraniv.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e24d174a60c6625df1f007e749ce7651/44301036145.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/pobonenowalezagasexifopug.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c0600e738---mowofawovunozetopesoxaf.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140719367a---70065601226.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e035d0d8f4---45595674818.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8b315ffa---97766977856.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3d3744e27---jogegokik.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/kozilojiga.pdfIn PDF document text
    • http://dentherapia.hu/files/file/zumusobofajodiri.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/vezufarolakajonifutatoluf.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/017mbms92k5hh4smtcmpqvjom2/nupomapegole.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c07e3dbb5---89273406321.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/62250989825.pdfIn PDF document text
    • https://empresa-venta.hr/files/80735969705.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/fesazalegi1625428786.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/81879372362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=atkins+fisico+quimica+9+edi%C3%A7%C3%A3o+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_off0000c6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 11584 bytes
SHA-256: 2929151ad7f8dfb5e23b34a35309d785f91365b7e7031052f1e430fe14f72e51
font_02_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 18640 bytes
SHA-256: f67864584bee3348b118628e1825a15f3149eb1d7717856015051aff333dcad8

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