Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaef978de5f62e17…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 03:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 991409cacacc3063f1c0862202a5595f SHA-1: e949b8c064ae07e01f8cf35d1bb823d958d4e293 SHA-256: aaef978de5f62e17fac8c638404f76e4623b347bf3462dd4cee1e0511bc7c944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to direct users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/36896803165.pdf In PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/95634346716.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/kejunefomevibavubopojuf.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/99073771763.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210907104707_tejwgy.pdfIn PDF document text
    • https://pecsikult.hu/files/file/vinuteje.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8b3916e3c1c2d65a65b7f354d0b93058/sofozawopagoxolasenidijub.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/50624308312.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/57972272687.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fdf9141fb---12947397718.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/jomuperodezipimolonasopo.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/jaxitesodonaf.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/29414530659.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c78bbed1c---sukunofavisawidufakuvev.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/fuminujuvenil.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/didakopigava.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/vobesunapivesobasobirij.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/dasoziraneladol.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/kinuvege.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/someroboxifigupunon.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/mikusonefuromewenugefereg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+kimetsu+no+yaiba+mugen+train+moviePDF 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_off0000c173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 11136 bytes
SHA-256: 71fc0f50dc5eabf52863ebd90315237765964c39ad44506796b5977f646dd062
font_02_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 18900 bytes
SHA-256: 36b800d00ebdda75cf22116e32238e4d15810a7e98f4ae6915b0031eda351c9d