Malicious PDF — malware analysis report

Static analysis result for SHA-256 1726072da59f6ada…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 23:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: de4524a6fafef725fcd7ee3a6dae07a5 SHA-1: 0f50a0ac9e4802732589b9cffa8d6671ae89007b SHA-256: 1726072da59f6ada41b92211f4ae5fe1edee7f6440d725d866c0f36435cd7dc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this document is designed to host a collection of malicious links. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=under+the+counter PDF link annotation
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a780ed6c---67474678291.pdfIn PDF document text
    • http://blueyee.com/upload/file/132100447487.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/62297142719.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052916121219.pdfIn PDF document text
    • http://technocom.pl/editor/file/tasir.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/duratazoxoboxadudekizaruv.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/10134803707.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf462cce0---riwafepaviveli.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d42610f65047a53d6d98a0481152c3e6/paxubov.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca12d1e880---bupivamezunolikiwanebil.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/67a004da857536a6ad7744f1d21230ed/jelotimasefanak.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607813c3e05a9---34616366856.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/c9678d65547700c46e20eba2408c4384/59726572582.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f4432944---mewemitenefo.pdfIn PDF document text
    • http://camonetinternational.com/files/file/95710280880.pdfIn PDF document text
    • http://usmleworkout.com/files/file/65527545367.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc69fca562---52379498511.pdfIn PDF document text
    • http://aplus.to/userfiles/file/jusugej.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a8125e163b2d15d87d3b2b4e4f3a79e6/gatolitum.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/2a5783e5c8acc1d5f49a671aabd09089/nanurofuxufusoxez.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923c688cfd5---rajobesagigugofopores.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aed65a43a---gomezefumazojo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/67paf3lk20tvmo0mfm5olakfjg/lozigebitos.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_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 17628 bytes
SHA-256: 63b11f0b3eb8ccd64df58a3a681e3dcbe8ec150d9f6cef82e21366576a863be9
font_01_sfnt_off00011985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 10108 bytes
SHA-256: 10cabeb3ef64c28998b2a224b2cf8553a019e64d82378dcb9fdfb86e29dcbc33

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