Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e1e1ef32280dd2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 09:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1f0fa86ca04894ce2637800cbeff33f8 SHA-1: 752189e870fb3abe89f85e4ec29d0c718b09c5cf SHA-256: e6e1e1ef32280dd2b141403bdeb01459f5e4e02cd54020becd6b0c131c6cefd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, including compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to lead users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://brincandoeaprendendo.com/fotosempresa/files/9210516328.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb9023869---pikete.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/fomefa.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/rabegoripimibelimig.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/padotemopevubukorava.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/tedudojunuxugasusisiz.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/70265222475.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6bc0f6825ec423406cc461b246bf4c25/nowukevomamadokutazew.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ffe6d34700346f3edc9f0693560d7f5/ripopevewufowo.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/80082203917.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/11ab80b41a53a7ccd8ea21c8431a4d5c/80367602413.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/vuwivewadujopes.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/40703886698.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/venafunetarinaredenes.pdfIn PDF document text
    • http://foxadv.net/file/mimude.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a258419b8---julobajinekabobizevu.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/60835690004.pdfIn PDF document text
    • http://zerosquareonline.com/file/80562297716.pdfIn PDF document text
    • http://www.pvvc.cz/files/vuliz.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d0f78d5e---nifepuvorugepuroki.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/barenidabuvomisadozusen.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16136af1d8790f---1967602765.pdfIn PDF document text
    • http://identik.hu/editor_up/39210355768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=s21+ultra+messenger+bubblePDF link annotation
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/wivizasuworirivit.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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 17664 bytes
SHA-256: c3c2dc2b8d32e33389a4aa920158840e174930dcd15e35a47fe20d4b856a8389
font_02_sfnt_off00011fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 10728 bytes
SHA-256: efc155059af855f1c7ec16caf6e2d017694295e20c6aa77747b2d93b8a94aca8

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