Malicious PDF — malware analysis report

Static analysis result for SHA-256 2550be48f906a9d6…

MALICIOUS

PDF

93.0 KB Created: 2021-08-06 06:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5339b1f8646ca0a7905e4b7812053719 SHA-1: 1be0b497b866b2e0c92fff56ecbc0d1fef00ff7f SHA-256: 2550be48f906a9d671bc791e3a1a66e8262a29006758bf10c9c202d4344b8a71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=what+are+the+types+of+housekeeping PDF link annotation
    • http://langeline.com/ckeditor/upload/files/69951214355.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/24826956511.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/47003893fbe1497d23873a47e73855b9/fulujilum.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/87929862679.pdfIn PDF document text
    • https://campermagazine.tv/public/file/totukelisimadijik.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/walizo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a809a88c---94227944222.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/7267014805.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd63fb6e652c90cb0123844bd75d3222/53377076892.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/16473232657.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7033e158768a61822e158d037938fa11/22069007179.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/285499501.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/kilagofofoxuv.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6019077fb---gofusabukemupuwin.pdfIn PDF document text
    • http://staropolski.net/Upload/file/mefiganigukafabibol.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607430ece91ad---kerizatibivuzudemenetileg.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e54990a26c---99892945257.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/376e59a88787cd835d80819afaec0eb3/newadajozopelobajapulifo.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/podezagiwasar.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/nameridawonajerova.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/rularaxunaru.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d1196be81---79801178150.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc03c524b4---18793025473.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/97603571867.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/jirive.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/64298278903.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_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 17676 bytes
SHA-256: e54802c2a15eac2a1198b3717ec3dd3d9f48bcf1a871e8b8749ff67b30a0da9a
font_01_sfnt_off0001341e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C35 10892 bytes
SHA-256: d2f083324159c88a3ddaad7ff96f748d64e4549e2b2d3c7e8ecb8f4677144fd4

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