Malicious PDF — malware analysis report

Static analysis result for SHA-256 56559b9399391ffe…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 15:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8be749390b634cf205698a941d2aad4c SHA-1: 9ca637ac5a1a0a47d1587a204b50850ccaa33d71 SHA-256: 56559b9399391ffebe99ed3fffd3d4932f8d9906d750ae7fdd6342576dcc990f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, often involving JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=txdot+roadway+design+manual+clear+zone PDF link annotation
    • https://tavcam.com/upload/ckfinder/files/40131881883.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e184b15287---mizobor.pdfIn PDF document text
    • http://guchenes.com/d/files/sijipumupapimowagubavo.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/84651520876.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/gezunu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad21537c3f1---7271144473.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/vixadi.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/27841140355.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cec2811601e---vijuxuwi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607880ca31880---55776967351.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nawobelodosazogunaled.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798e2b5c988---potamuboboxit.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/mafetadizanagezuzo.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/xizedavudidokiwo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86b3d06ef---begon.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/50178740439.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/39151413538.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/58162207323.pdfIn PDF document text
    • http://sciattella.net/images/file/nozetexiwukusuvubixegej.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd8b54a0fb9a7af5ed2f5d3506a6802d/49951857640.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2790af3356cb2164a12ad80aa1907228/surugevenune.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/drtl5sd9f06apgerjd82kh7vo1/dorubakofuronufexoso.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d31b7d8ff0f---kugutevonamoleravelil.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_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 11136 bytes
SHA-256: a69c7fc1cf30403f5fa2d6e4dea589fe341606d78d30fc7bd2339ab76f054d96
font_01_sfnt_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 16564 bytes
SHA-256: 217beed5fb056ed1526f9c24b19d23cf97028f7056a37a97e6d57bed2607764c

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