Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1956fcaf2caba2f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 17:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 12ea7f313867099a2c7c311932603da5 SHA-1: 30334c1513fa2912b6d5aab9a9ac932c84437be2 SHA-256: c1956fcaf2caba2f53a25e0e1ba6db24a5dccc9d09fbed1647a90aa0e559a343
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lepal.sk/ckfinder/userfiles/files/zexumaluzujeligatipenaxid.pdf In PDF document text
    • https://gruppopolidori.com/upload/image/file/wimefape.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/goditemene.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1607285326cb19---najez.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/65999451588.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779571dd5c1---38487679148.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/46a899772088e172594c3a110cddb120/65261662252.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/18173358828.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/8630e872c621f20e2845ec73fc2b0546/15136784163.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12f87062e4---61406961650.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///nenomuwesoligadeworow.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/tojifopave.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/zifawaziwesosunar.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/vopngm2o04mntrqikjhe7bpe5s/13402346670.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/48048945604.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/raduwo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff7adced3---zujifuzisabeforif.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0c4bffe5daaf99f15c526609be9fc0ac/16405265934.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/39660803599.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210902_100603.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16115cee77a9ee---miluvowukobekerejokin.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081020e8c162---21028828129.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea83c75a26---juzibogat.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/68268000086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fashion+magazine+pdf+clothingPDF 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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 18224 bytes
SHA-256: 710b01a3d5642b233f877a5f5893ef347bcf41cda3ee514377effd6561a96c6c
font_01_sfnt_off00011cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 11004 bytes
SHA-256: 591c4ec87bda13e4117bbc369fca965876a5f2dc9532a889f0ffab447a5219f7