Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d36044912fe908…

MALICIOUS

PDF

95.2 KB Created: 2021-09-01 01:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c1b3aade8dffdbfb7eda34fcb0b5daa SHA-1: c7b5924a588b27bd35d8a8610ebbb928071e5bad SHA-256: f1d36044912fe90803f02b3bc4b86ac8576fa415c2c60f69801045bafae448d9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS uploads, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these links and the nature of the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/599a2577db98653980e566b4a770fa8d/8995029944.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f90c2730e---jabivisuxetogewe.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/6534539491.pdfIn PDF document text
    • http://gistys.com/userfiles/file/31389276754.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/zosasabatelafewuzu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b49936511a0b23d8c11f93771ca72c4/vukumixedanefuno.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/77804469056.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096852777029---vutobifore.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210815091255.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad93968654---gusovuwi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607146b0b7e78---68308111931.pdfIn PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/2e32265ab97fe9e41faf5ab12a681110/19337692185.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/mufofegobux.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/39778166639.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088beb127e30---70333805836.pdfIn PDF document text
    • http://bjallstar.com/upload/file/9821644338.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/200743345282.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/dudupegowufobi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7ee702fcccf0b92ff7789ba78e27e067/73346368304.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/65361433442.pdfIn PDF document text
    • http://delve-cr.com/uploads/funenolapifupubakokuropim.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/97948689934.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c20841a3f19dfc37aa3f6eff4d6681d7/59733956253.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4786122a1---93745002557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=photoshop+circle+outlinePDF 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_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 18720 bytes
SHA-256: e98d20e90bab5b5e951e4b3255553b64419d80d2568515092189ce91fdbe0bfb
font_02_sfnt_off000156c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C7 10408 bytes
SHA-256: 8e7a2ab183e86b8e922d2c16b3ba1b95f552993dd455f60d3668549c49bcea1d

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