Malicious PDF — malware analysis report

Static analysis result for SHA-256 4828b6dcbc2ddef1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 02:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cf7f0fc92341a50d9912c80dd8a80d80 SHA-1: 737da5aadfce1d2583d7b771fb76ad68179bfe5f SHA-256: 4828b6dcbc2ddef156f3eec8643ef2871a8bf1b7e9cab084a803ef4e3b250bda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=converging+media+5th+edition+pdf PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gu2bunbi8gopvpn1oncda86k9c/50769758063.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/sonox.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/fufeb.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/53399523486.pdfIn PDF document text
    • http://mesterek.net/tmp/gafigomopikeside.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/fovaw.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/gozagifojubokedosorusol.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/34818284540.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba524c722a---6155108521.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/npkfms0nt5de5phtteh4d6i0g2/92928860941.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/34687b522263ec360a85c6c59e68f8b5/60559536831.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/45178681104.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f65a0073c7b---namitumamamu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed8104b883---38988246156.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/duzilizogununeduwu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1678b53851---xugobelovamabepid.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f558d23f---55872772263.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/55458366469.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/9635574219.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fc25b44250cbf2d119ffd5ee9bec3cc0/mobevakoruwovuw.pdfIn PDF document text
    • http://com123.vn/uploads/file/kuxivimifibuwosod.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_off0000c3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 10964 bytes
SHA-256: ace06049c3c5e5ea722c89cb625804bc39b45404b37762cccfacf3bb6206815c
font_02_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 17680 bytes
SHA-256: 68916f8e0930fe4afaf2ba1ab0175f790b15bf3503afc889ec1b9d675fdf1c05