Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a93795fee6932a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 23:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffb775b86f24229d4ca0918ebd485b96 SHA-1: ee9bc9781428a43d88c5ec65765d154d9d8d676f SHA-256: a8a93795fee6932aeeb0bb01dbb35c68b667785061d08f215962128e9300f090
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final malicious destination. The primary attack pattern observed is the use of a malicious document as an attachment in a spearphishing attempt, leading to client execution via exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://foundlight.ca/home/foun6192/public_html/files/custom_files/file/50380707394.pdf In PDF document text
    • http://enotecagaribaldi.it/userfiles/files/68887145079.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/lavelarikeluziwosovamexiv.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/waferevetapuj.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/1532824376.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376392edc79---fegukunavofowiwidixek.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161393e9124790---penelenoselokiket.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/60760539325.pdfIn PDF document text
    • http://vitrine-prof.com/files/pipemaxawawu.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/fopekivoxokifozikonatap.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/vulavoniberanavozuxeko.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613622ed63b28---pinebiwetopim.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/mekimakevomemagopalu.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/zogiregunavojep.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/81669321652.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/vinefijasudug.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/eb15f8d8d7888210af1346625ec4ff7e/78780012474.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/xemox.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7b6de649b---33221108510.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/33939103937.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vojatuxasotutamutigux.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/78596570235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=harry+potter+full+movie+in+tamil+part+1+to+8+download+tamilrockersPDF 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_off0000afe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE6 17244 bytes
SHA-256: c268102852b01d6bfc2d914c5616e896eb25f1a880493e4a37a6e76830b3422e
font_01_sfnt_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 11492 bytes
SHA-256: 8b31830d33767b54748ad513892101eb5c63c9e2673b581f0faa56b85fd6093e
font_02_sfnt_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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