Malicious PDF — malware analysis report

Static analysis result for SHA-256 947f85d4e215d3cb…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 10:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c774fc99abca6c447551280fb9ba69fc SHA-1: be99aae3ebc44dd511c5fe42421896feec9406fe SHA-256: 947f85d4e215d3cb32e17194a96f9e19be8dc5a3ea56f80b9d646faa6978c591
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bioscipublisher.com/files/upfiles/file/57601068843.pdf In PDF document text
    • https://baptistfriends.org/media/regiva.pdfIn PDF document text
    • https://norservis.cz/files/files/sedukejerazuvurosopesu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae21cd6d56---93134739417.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/48519501405.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/lukadimegeketasizos.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/3b89edffd8c919e616c71622c829902f/94484137940.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed5113c639---noseg.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/kapog.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16102f548d4584---95509887932.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fd929933018d334b53154e89a6f66104/ruwixozubixidet.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/707603156.pdfIn PDF document text
    • http://hasyo.net/files/file/nefokaruza.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8f40df60---zirojawepinitudutip.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/lonufekoko.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/38976536070.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1d2b9800741042d47f87e808333d5e59/vidakusokuromu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16079bef8b367e---gibitabedidupoguva.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7ece4f5b6---kumimebetoxadafesamafifad.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105240937421539.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/58552128365.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/domulijaxafaninujaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+save+an+outlook+email+with+attachments+as+a+pdfPDF 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_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 11120 bytes
SHA-256: d4840475aa890866071426fde2af9e61f6b31da7c0175744debc3c5343798e4a
font_01_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 17824 bytes
SHA-256: 3ac6ddf7d9c77638c79cba65974147af4f019f5389b793cac155bb8a9bf7c040
font_02_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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