Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce0ba4a62a86b2b…

MALICIOUS

PDF

92.4 KB Created: 2021-07-22 19:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d04414799ea3c42bdcdd4b0cb0400299 SHA-1: 8dfbf8c1a5550999a3498bd170702af20df50d02 SHA-256: 9ce0ba4a62a86b2b043e7438384b5274d1b449ce165835bd6379c1eeabad3718
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://eltonltd.ru/sites/default/files/uploads/76262353332.pdf In PDF document text
    • http://maihome.hu/admin1/file/44929476884.pdfIn PDF document text
    • http://gtshotel.it/images/file/90050189388.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/00e06e7c7aaae7d5b1801506fd5feb5f/32378946541.pdfIn PDF document text
    • http://simonide.org/userfiles/file/xemegawokupoku.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c5dd46cd---zozep.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/777996fc2ee7314313b3c6787a781e43/4258175615.pdfIn PDF document text
    • http://merwepizza.com/upload/file/68344072510.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qhq5ailghotsavikan32bi44l5/9564067058.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/jupogifadutumabaged.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/15849071705.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/99381716025.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/78666335688.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/98967920575.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d405a99e3a---2589932524.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f4c5873ca---63702503548.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/959238424f1493ad52e29923de4263d5/guwulofojilixogub.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jewiwekisuzikoja.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/37786632427.pdfIn PDF document text
    • http://teraval.cz/res/file/dipukowizevadirosutogupid.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/24561287712.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1662c0ae---40108193632.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b1u4i2n3uht5f9qvcrt7e7s0f7/18866162099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=horseback+riding+lessons+costPDF 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_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16888 bytes
SHA-256: 48ba16fc2e3484ce0a07b4d08758ac8951ee1db41d9e35457b2fc2a55f023394
font_02_sfnt_off000149df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DF 10768 bytes
SHA-256: 767d16224e6b968fa392d7081940f159b6276a318ca9b883105211a1302c0528