Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b92eacfa908b5ee…

MALICIOUS

PDF

82.6 KB Created: 2021-08-23 14:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69670442d397eef139ced2e869b76529 SHA-1: 1cfdea802ef0668a28b7e2049d2e7d7dc466b786 SHA-256: 7b92eacfa908b5ee88e747f7084bce205ccf3415c2ccdfc98fa57f213247dde5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious URLs. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://thinkhigh-tech.com/d/files/54272604079.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0jlaqkj06k2enh5nao5emlvvh9/66883456429.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/46054932570.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/51282524817.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608827fb3e435---jidoxasiluxelaku.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/jau4mncqo5atfu5u0hite5llao/votijafirekebukave.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/el3ebet1aimrgjedh6uslt8kk3/32435868365.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/73515936936.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb088e51f6---37287492971.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724a2038c88---liralimaji.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd923238267---97566420474.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be095d4278---lovubijigagegomaru.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/71601083762.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/bazexogukalemomelakeb.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3dfe01038---62882622568.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f865abdacfe---79438830093.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/73981499587.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/31579101433.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/47ec17de77470ef84c51aec8b119f264/xedozorilel.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/75054448205.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/8416952755.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608139f2caa2e---sanilokelofe.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/vomolujip.pdfIn PDF document text
    • http://runhouchem.com/upload/files/71591181484.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/wikamamapizak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=acids+and+bases+physical+propertiesPDF 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_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 10848 bytes
SHA-256: 4ce6243ce31efa0eeba9baa297a457a21437aeb2aef8fd899f9460fdd2d1b690
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 16884 bytes
SHA-256: 7d5dd64a50271177a87a5730303856f935c5f379f59e44e356be79b0db04693f

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