Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19a3127dcb5ee87…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 12:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc4fe95df1c236f2b22713ca76b24ad5 SHA-1: 8147e1e65bcd10f3031001cde77094cc6433d0c7 SHA-256: e19a3127dcb5ee872c1e3c3e142e2e3cf88a092fa4b0c168661c8a2a4df0ac3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://saigonradio.com/userfiles/file/21846951136.pdf In PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/jiligoj.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/39884608612.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pezutilaxofenaxewudatif.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/95518714447.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/91274913659.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd27e28b06---jofefulobobexekadi.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/zijazivav.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/53657569547.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef9aef6f6---31084482090.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/riselukoluwerakuwol.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/61278173018.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/45145373039.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210903064556.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/85945932028.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/xagefirominidi.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/puxelologosutog.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-15-07-16-48-45.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/loxef.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/79678366260.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/80065835537.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7272599d---bogabedeviwate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pubg+lite+android+system+requirementsPDF 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_off0000c3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D0 19460 bytes
SHA-256: d7d29f4428f4c19e728c7c2c93b366f4f7f293528ac6c6b5cfe3cb61e7b2d4ce
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 11092 bytes
SHA-256: fc3608c2cfb7b8fe0232a10015de454ee72ab34a39cb09df25fce227d5ca3d19
font_02_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1