Malicious PDF — malware analysis report

Static analysis result for SHA-256 3429f69da512f80a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 13:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e7624ddeaaafa077bf30d6b50b55152 SHA-1: bc1b2a623fc416d6766f70e35063ba7c738564a6 SHA-256: 3429f69da512f80aa0a4eb5e6f36376d6e4eeda98af283eaac31568f0ad6074f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The PDF structure and embedded links suggest it's designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.alexgis.com/siteuploads/editorimg/file/jetuxiletekubavup.pdf In PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/35287805671.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2f12a9a4bd5302065e9fd927ced3acee/pinefafuk.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/74586183084.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/japulideduz.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/jugozikoxomomutosire.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbcef186310---paxufojerexenijisa.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd6ae7309---noxav.pdfIn PDF document text
    • http://stevis.cz/files/file/relasakitizimovoraxowuxu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082621a6abde---90751935276.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/37301652467.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/4qcqm2d73knrqd9im29jcepqbe/60970298529.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086d18356d6a---57852537986.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/megopokisunemerob.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/rarejutodasodigimatijuxig.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/73d670eab614fce15d96846b8f701fcb/sezizorizijujajulan.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/daxevigeluxogapurubote.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/41059999376.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/mamuwugifeza.pdfIn PDF document text
    • http://katachizu.com/img/news/files/94920672942.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/pekolofiwegu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/huvmgi81ou54d5de0dqlmrikv9/fupanusut.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/zixilofedupofoxana.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/91266327633.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e6f305514376575b8609104a0244032b/75094616218.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bhhqodgtn40agj1qvfaqmhnokp/52412625974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fiitjee+reshuffling+test+papers+class+11+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_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 11040 bytes
SHA-256: edae8119c2edd96ee2acdb22c18a499509ccce32f1bc0a47956f8a88ee5e849e
font_01_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 17780 bytes
SHA-256: 4a31d76def994bf9a3f6d2f0664c550a2ed6fe29dac901f967723c40a9f84e34
font_02_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1