Malicious PDF — malware analysis report

Static analysis result for SHA-256 478dac8ae54690ee…

MALICIOUS

PDF

97.1 KB Created: 2021-09-04 06:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0179d15c64cafdb362731be43c4b9649 SHA-1: 091bf696e2e7d023d9101c1a4aac4cab3492de85 SHA-256: 478dac8ae54690eeef879d4bdbd0f985693bb2a5d9dbfb220f5a07e680ab153e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to potentially compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://archism.ru/uplcv?utm_term=von+hippel+the+sources+of+innovation+pdf PDF link annotation
    • http://accessprecision.com/userfiles/file/69520506552.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/12639561039.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/lg5tthouhv35g7esiun255r8pu/78758630791.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/egr8nktooctvlk0eqdsgt6ho11/11728060786.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/xupona.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf4e3bf0f---gumepazew.pdfIn PDF document text
    • https://nomortiga.com/contents//files/48166458846.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/30967044325.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6383a160---dekevi.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/2486092243.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/dabedonijoziziwapikufupi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e83a97ee29---rupebamisixifepogovawa.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079524fa1735---jilajimexitoxejudotusipu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/p6s5bvvqtl65dejvbrclurletc/wejajugutelisatowux.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/51824681615.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5bcec2600---pebokapebamajejonuzoraz.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/42870024018.pdfIn PDF document text
    • http://rsst77.ru/upload/files/27563281880.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/38232567951.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882f5d8310a---juwazinunexisomunas.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/puduvalewojedasemut.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/dipidekub.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/55291102241.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/muxukofunaxukogut.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/42715910883.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_off000111ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CE 10852 bytes
SHA-256: 0a38c05932e808cab92fcf638458d411b8f3e5466f3774cb8e41c65e5652de44
font_01_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 19676 bytes
SHA-256: a8b7e6732f81533e2aee7de02c616eeed6278d7ab12147d574192232f42e098c
font_02_sfnt_off00015e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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