Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba52f4519892f31…

MALICIOUS

PDF

72.1 KB Created: 2021-08-28 17:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 96541001070f935e6e38e70fc2101c04 SHA-1: 513c4cf6715a09d980064125ec1f1cf13c0fb522 SHA-256: 1ba52f4519892f3182d3d1d77213b721ddd77c90ec0ab939cf23f31072c28486
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://suativisamsungtaihanoi.net/upload/files/wuxarudenuzeruw.pdf In PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/93172417169.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/viripavibolezalavu.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/39763828796.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/damemotanilotolek.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/25820111127.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/rawibepakimutaxoruwisaj.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96cac7f4e---82634964650.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/1527901845.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/ruwagarilijaxefuvubajesa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba57fe5bee2---18472982971.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/90110454693.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/64447c1956eed7db0d992c7ebf29a090/77066397207.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/sifonawugapefenubabasuj.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16084c901d9515---29851519450.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/rebux.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0c554120e91106a3587f5fc46ad34e5a/87135184156.pdfIn PDF document text
    • https://yodobashi-church.com/45286361310.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/14933273450.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/4754718908.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f139300b18---23859283516.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/32089403132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=name+the+ions+present+in+kclPDF 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_off0000ba73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA73 15856 bytes
SHA-256: 062529ea64467d7a5a3fd9539f45f69fefcad6e7d4fae61e97d2b8ea063b8720
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 10708 bytes
SHA-256: 31ef0fb087f946410ba38290ab76f9a38a4e8c079be9e0d03824bcf5ac2933b0
font_02_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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