Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47d144426aad461…

MALICIOUS

PDF

85.9 KB Created: 2021-07-18 01:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dfc4c5f867cf0457e8d886b475cc71e7 SHA-1: 7edb4654f993f4cd01d0a5a721b0273dcd20db43 SHA-256: e47d144426aad461664722876239f191421b5bdb7d7a2e9b5201ebdf4b9293f1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://lamexmarket.com/uploads/files/doganabumidigo.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608946fcd18e9---38264661443.pdfIn PDF document text
    • https://penal-garazh.ru/files/9771337022.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/biris.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726ff2bdf6---87804652847.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/lesesove.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/17663547050.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/23188956201.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/wowujosamafeporolum.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/93483998789.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/c6ugi3q4pf4or2jf1c98ec7oji/15864801346.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e9cf730ec---goxapoxalarozevig.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e7d45ba3---titawaru.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bifekepisaxi.pdfIn PDF document text
    • http://imi.vc/upload/files/fowedebavin.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3dc90511---1496732985.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd51a7ba0b---wotowitazu.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/resazutenirob.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb0fd26e35---39187206999.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa66c92b74e---logerejovogekovobujofag.pdfIn PDF document text
    • https://tigapilar.com/upload/files/jujamixew.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/duziruwebovaxo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160eda2c85d91c---pidoke.pdfIn PDF document text
    • https://artbynela.com/uploads/file/68113051573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=perfectly+elastic+productPDF 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_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 17496 bytes
SHA-256: d0ccfa1c51dd666486ddfc6ae099ac7e43005449a3079871c23544229629fda6
font_01_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 10724 bytes
SHA-256: 9e47c2266601f4e8d32fe7aed0729cfb560cd82312e58587adbd2a30735ab2fc
font_02_sfnt_off000130b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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