Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4eaf39df018bd0…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 09:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec3614dc5e6d8a2c46d547e37bb7cfcb SHA-1: 6f68b1bcf45acbca96c68f6cfe11494217db34d0 SHA-256: 9a4eaf39df018bd02d1cb428d8590b08e4ae39745143f7155f177728ecc88546
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, directing users to numerous compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages.

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://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131bad6b53c4---jipuzisipo.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9bdd83caa---42599137675.pdfIn PDF document text
    • https://zhansq.cn/upload/file/9983684509.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/12559486959.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/tapobog.pdfIn PDF document text
    • http://fluorescent-training.com/file/kusexasowivananozexun.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e31edb06---76012233843.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/46067205515.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/memedomi.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/xuzoloradusojapilemugup.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebcd35aab3---43965079747.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/86903743584.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907112501939.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cbeb66bf89275359e6625af055640cb8/4261778624.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/52621146571.pdfIn PDF document text
    • http://charivne.info/images/file/jetuvonuxinewedojofugo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/3b3214eb5265742f96f55e1f9cdc895d/78644621944.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/zerumukawa.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/zujoxe.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b56edd159fa50937a91776991942dfb2/67480680826.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418ba7f311c---18999876422.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/74583797792.pdfIn PDF document text
    • http://cbstav.cz/file/dubetoja.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614821827abd2---fifozubuxexosatirofuledox.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/vejotolapipulabazaginikuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=play+games+on+chromecastPDF 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_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 16484 bytes
SHA-256: 9cfe76528d06ce8970fd333bffaec388d0cffbcacdcf5b69bf4042ce164868c6
font_01_sfnt_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 10700 bytes
SHA-256: 360d4271b20e41ac35f8a88123a3033ff7e2e527d68408476c8c1fd4b048f281
font_02_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1