Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebafbc43d4790de…

MALICIOUS

PDF

73.5 KB Created: 2021-07-25 20:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6bfb790d6812c15243c9bb62214b956b SHA-1: 7edc9de90cb1aec563fcc9d65ba5ccb5f9f9d6e9 SHA-256: 3ebafbc43d4790de3a0931811541c4aa651c18b6085f628e96e3ac4a1ace4ac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://srutimusic.org/userfiles/file/rekisafefi.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/dv220jj3lcl4pa29ou5oq9nki7/43226740859.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67eca4f95---ronejamajasan.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210527061816.pdfIn PDF document text
    • http://geoman.cz/data/file/wixumuvotonozufifor.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/72947883552.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/60792184756.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/tefoferukalij.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5403f306---67529430773.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/laxosepopomaxaritadutare.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/a2308488f82bb6b0c919d10a1d8e5176/68067685658.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec671184f---39846835490.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44cc9ece7---jegixefuza.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/68286995880.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e042f750b046ab922a8b2ba86c399062/87923729720.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160893a788fc37---95605885617.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af9a100c265---69969403429.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/62543231344.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/69705579822.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/66e0f4a2e4eaf1bf377d73679f05c184/36869841694.pdfIn PDF document text
    • http://novichiha.ru/pic/file/suxiditixowumosonezijimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gloria+a+dios+en+el+cielo+y+en+la+tierra+paz+a+los+hombres+que+ama+el+se%C3%B1or+acordesPDF 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_off0000b863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB863 11584 bytes
SHA-256: 7563c662ac017ee032080aaf6d16afeb7fa55cfa4249bde7feea96c0f3044844
font_01_sfnt_off0000d315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 16496 bytes
SHA-256: 31934b2730b8a1e6d8061071918e872f5022c0b7f9d7f543e02065dd1f0154d9

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