Malicious PDF — malware analysis report

Static analysis result for SHA-256 e226359b19da9206…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 04:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 561e32b0134eed01b7c63f38dd3438c9 SHA-1: 296817d62e63631136b8d8cedc785eb88e3f3c57 SHA-256: e226359b19da9206b54a9790cb5910bfe163fdffdf1512355003bf0552a70928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=java.io.ioexception+error+end-of-file+expected+line+pdf PDF link annotation
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sgk3g67garojc15vn57qrnmh05/28236985883.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/95329065062.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b5142c3f6---91559797436.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210728015602127.pdfIn PDF document text
    • http://elm3rad.comfile/49595377380.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/fopofazuweja.pdfIn PDF document text
    • http://bronia.org/userfiles/file/96609933657.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jijizipum.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161157cd843b36---nejafunubavafanifajewo.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/safadivoverifeg.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/1e8b7f2ac6f551aa2cff8f614b3a0088/3243420781.pdfIn PDF document text
    • https://kermanrooz.com/img/files/99354157174.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/738878815.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/14169511981.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/xemuko.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe60a76e59---83667356812.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mohbhvgccvcdskcfsftgujrn6d/wosas.pdfIn PDF document text
    • https://medpressa.ru/files/file/kemudadiruvud.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/29237693751.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608062905cba5---13003618963.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737c1530564---goduribeba.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1610b387d9f13d---72823341205.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16114d2eb37e04---welamikafi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/02ee4d87e50eaa2ab0ad65a89fa72bf5/6387124312.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/16942982453.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_off0000c20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20C 10704 bytes
SHA-256: 13564db170a0d9d8a9a836cfdb9a842426b401e3cfa510d70fb8486e47b5af43
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 18064 bytes
SHA-256: 9ab3070dcc6a82a7b563d66745c63f8e5ef67c8933cefa69c7bf656e49a940d8
font_02_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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