Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b4bf10b053a18e…

MALICIOUS

PDF

83.7 KB Created: 2021-08-17 13:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f310101bf5b0ddaf1f7987a45660400d SHA-1: 1670696e500bb34857406bc284c7d15929e679a8 SHA-256: 86b4bf10b053a18e79770f8d678935e6a1f2ca9e0f0fc899c0953a9d13be1a68
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, indicating a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6fac82821a9a71d4f9b21ad6b3462e81/ginusawaxo.pdf In PDF document text
    • http://zavalinka.by/var/upload/file/fuwofevozemedi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/70739519721.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/22b5fd9ba0ef83a8c6f380b7e2e68147/pefokovuja.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a68839ce1ba---70501710329.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9fd4fe702c2e2bd538379ee349ad3edc/gupepururago.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xuroz.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/29237855646.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816425c7c98---79626401575.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/towaxuvu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b749a388c40dcbcabef0dd4be0b90cbc/24759493019.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/188ecd7415c9abbcf9426ba57117afdb/xuxusep.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/40192917119.pdfIn PDF document text
    • https://medtek.vn/storage/file/julogubuvowezawavoxosebi.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/sakixadugatetofoxawaz.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/28b55f3e97998c0be7ca528f1c00b759/dawulipal.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/42fad0777a19d7d8835b682a75de3b46/11537690406.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/80324832706.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/nsfalt9uk3jelgb7pkun0ttvs6/5870103710.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/87691076864.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/wipasularefanezopid.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/bovetekas.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/surugulo.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/15216324419.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160946dc923197---zoxagetesakupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+convert+mxf+files+on+macPDF 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_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 17100 bytes
SHA-256: 44fedc1a47e21917758d45d50cb4ff5181b0cd30d6de3f2a71d18c6c2620cb51
font_01_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 10744 bytes
SHA-256: ad6cd6114f6a52d2dc3b26d7318592cc774b7b7b3cd11d68fcd42a1b373d76a7
font_02_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1