Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04df04219fd6406…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 02:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bf3037f30d1924818d9f24a8bc919e5a SHA-1: a8872c33a9eca2d9bfcc460a97997d60192f9a66 SHA-256: f04df04219fd64069a229648e816c994aa4e167c3d7a6d8fc6977e6c404fdeda
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/rifawujagilunu.pdf In PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/19943171450.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/40c301d90bd16dc71b5bc023937c2c99/daxusujozanomanokozom.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/75902566335.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613537e2d2c9b---noxebunufugaketumuvi.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0d075d590f09e8e5cca6164e7d16196a/66942662396.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210906/file/16308578109148.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c5077a8d234da418d3c95c994e872578/59589684698.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/vutas.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/xenepalipasabigawafam.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/68769147921.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/50664706525.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18ff3594f---10176140215.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/zoxepezesoxufijezip.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/sogevewipedo.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/nekukiwuwukuvilatuvutotos.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/63405547998.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109111934462801.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/26544212897.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/18635368278.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5ef88a5aa37d738e104973d830ee3046/18059998929.pdfIn PDF document text
    • https://campermagazine.tv/public/file/bapoja.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/loxeva.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/33841824291.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/87722430754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=stick+war+legacy+game+hackPDF 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_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66A 18256 bytes
SHA-256: d7e5bf2d16a294f2539081c9cba815fe7eb0cbf17e87cdd5253fe9131c8dc32d
font_02_sfnt_off000125a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A9 10652 bytes
SHA-256: fb4b7d1fe0c0df5e1d4f8c61d30dd1b531bebc7abff5025bfae354258e9ec99d