Malicious PDF — malware analysis report

Static analysis result for SHA-256 942f7982ce262662…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 13:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4f23041f13cf9de0e0283fb3f081b13 SHA-1: a2b5d1b0cc84c546de6fcf47a97854a7e4367f3b SHA-256: 942f7982ce2626620ef5129cde58128e26c17afc58d0e06be517b33ee85ea8b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=instagram+password+hack+link PDF link annotation
    • http://upsshop.ru/ckfinder/userfiles/files/13527892318.pdfIn PDF document text
    • http://chinazzjx.com/d/files/25813380532.pdfIn PDF document text
    • https://pcetravel.com/files/file/gatixujabiwedisunalipifu.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/30101946986.pdfIn PDF document text
    • https://expomediainc.com/upload/file/rebopo.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109011100112630.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614301d54aaf4---12448771659.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210919222932225323bkxgy.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/dexuruxiwulafulepuzu.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/kagerevu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/mixaborakunekuzukap.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/73482695789.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/ketegonopejofupugukagakux.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161393052a2031---21857189958.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/7027000750.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/3460948901.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/80adt9f4gn6n32g1n7i8r8gpc3/83450593168.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/sisavufewipujabeveg.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/52017332819.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210903_201657_8304.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dbff16219025be8dc9f6575f7767d461/sudovigeroduvebej.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/20829306693.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/efe2nsvvrqt8u5nb9vh873eo5d/fesixajizur.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/fimagesapifipenapovexez.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/69841452689.pdfIn PDF document text
    • 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_off0000b0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B9 15228 bytes
SHA-256: f2549e71eced2363506f967092eab7a545f87d92865c703643d12686a4626790
font_01_sfnt_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 10956 bytes
SHA-256: dd5be5c57df19638ad4058adeb5b8e26b7e3377d7490acc8cda629da9d4f42b5