Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c4657615b9a087…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 20:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5eec4ac0c422a26759e43740e0773beb SHA-1: b2180bdf58da538d4f1bf793d353a0c42f6a0905 SHA-256: e9c4657615b9a087f9a76e0fe6946e851a7a95b955a8eb0ada9b44207ae6b2a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://stollerco.com/testingsites/advantage_aviation/assets/media/file/kivisepiw.pdf In PDF document text
    • http://coumert.com/images/file/79937154962.pdfIn PDF document text
    • http://sergeybazarov.ru/file/12907841269.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/6goo8o6clp9idim8568s53n1r4/59630882480.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786b818900d---74386878125.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/lilopof.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xuwuluvipojunivaziputilu.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/nibepetipatejel.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/8425d5d4cc7496f88b4d69c35190d3d9/memalegenenulajudadamituk.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210827_0E080588FC393AB0.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/35308621786.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160905f0343a20---58312820113.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081934368f45---garizelirogedivedefud.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061b7550022---99205501804.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/95781298623.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/25373094441.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/5841119688.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/45364931583.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/251310263032.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fff6c96459---nigajubezewifeb.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16108f10630774---32291233282.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b7ef90b6d6829f18ef4b9e3d3b562cdd/xajabubogobodegufuwijob.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/bumujixanamirodegu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/26b6eafa982f9e9480f4012b533fb184/norirasojuta.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/69756577078.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e28410e6---pupukawudepiwisawolujiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bank+of+baroda+mortgage+loan+application+form+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_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 17500 bytes
SHA-256: 760f67df9d992870cbcd715042a7399abe4b7ae70c23562b78768d4226c649a0
font_01_sfnt_off00011861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11861 11080 bytes
SHA-256: 8e6bee9a3dfe1038499b2de3c3961bec4e3626ba4aa08e437ffb8a2e0d21a1ab
font_02_sfnt_off000131cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1