Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e6e052ecb9a9d8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 03:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bccb14d0ec60ded877813345f90a70e SHA-1: c16ade082c2b0fd860d7967127d8f6d45fa178be SHA-256: f8e6e052ecb9a9d803ef13bf98f2af9cb9bd225ffc94549973dbac2c340a757e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to host or link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wyslijpaczki.pl/app/webroot/files/userfiles/file/25803942106.pdf In PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/66250842108.pdfIn PDF document text
    • http://fourfoods.com/images/files/86977186335.pdfIn PDF document text
    • http://www.og2c.com/images/file/26569941766.pdfIn PDF document text
    • http://rapet.hu/files/84895826293.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/xopinowefexazexojoj.pdfIn PDF document text
    • https://ikima.fr/uploads/file/wasixu.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/narobuzilewugavixomivujo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161380a4bc3b71---29030379687.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/65430693668.pdfIn PDF document text
    • https://academiesutherland.com/userfiles/file/bivemelememosaw.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/vebagipomilowimomuk.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/q1gd5ibot6969ohfiuls0qpg21/56921865143.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16145e3f001132---lumujuxebifekine.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6dbff0d11b60d55720def96a2d2eb20c/24379506866.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4cf0f9a880b9aab0f70363dc8cf139e6/kixabimizexep.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/85701791796.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/wifodofikuzedibi.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/werisomupeju.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/64673160505.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/22566824980.pdfIn PDF document text
    • http://i-dron.cz/data/file/rekazudivofuzetamuwude.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3fc50c649---kafinuzito.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/suvewozirawizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=flappy+bird+download+play+storePDF 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_off0000d30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 16812 bytes
SHA-256: ed3ca61a835fc32c5f67d1d8e0fe37fd367f5ac26cfa935850249427a918eb3e
font_02_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 10700 bytes
SHA-256: c2ed4edcc433b97c9f739b689f47cf5416426f5127684809d99214b2b690115e

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