Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d715f6ce256e13…

MALICIOUS

PDF

101.3 KB Created: 2021-07-20 04:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 0476f93ba3e92686bb32969d177cf9ae SHA-1: 28a1e73d2ec31b1fc6a890994fb24689a68da4f5 SHA-256: 67d715f6ce256e13c03e994ad511c50e2925fd0873e42c23ef4d4ddc47099fa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards attempts to distribute or host malicious content on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://adaviestransportltd.com/userfiles/file/37006483927.pdf In PDF document text
    • https://fl-forever.com/upfiles/editor/files/fezufiwa.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/36268078296.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/levezoxewisupotumimirix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e815eb4a89---wipozuzumewevifuj.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/bd36d439dc0b26498984f6d552141fca/wimugixilod.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f810609b6---bador.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/78422141357.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/dd625963b1f3e56b26cc2c67de6bf150/69968006159.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/93404919035.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d4edfb175e4c9a00580f209f0d6b5180/93011506260.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/83805780478.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4234c34dd---17040196904.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5eea64a76---82717665100.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/67344942972.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a6522855c8c0249b48a47072563dd271/96741976979.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/07f6c6ea2b6f9de527ccb7ff4539e5eb/11005679742.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/jotevamuzoxuvugobuj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941481a6d92---24678863060.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/fodasavasunudutapinibu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/8505661002.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/68824661064.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lk6kb03drqdbf4o76r58lg7g5c/muxenotes.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbd8c388f---gibomupu.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fc7353f8ced79cbc1f701d426c95828c/kafuvitazokewine.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kebesetijuwagojedepobusax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lincoln+abraham+biographyPDF 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_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 10636 bytes
SHA-256: 600af6579b8c89f55d68b6a129b9cb6f0527a0e210c5db434bb7cf7992a18c30
font_01_sfnt_off000141d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D1 17544 bytes
SHA-256: 4a54b6234f0cf8249be01e737e8f6b2208de0391e4956133f73b12e4612f4725
font_02_sfnt_off00016fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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