Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aea6a40e7d1e0e4…

MALICIOUS

PDF

85.6 KB Created: 2021-07-01 14:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f1d7e0a02ce30021cdb6fb1cceaa8a03 SHA-1: bfc6d85026d74874f3318d1ab08461a694aa4af2 SHA-256: 7aea6a40e7d1e0e4bb34e3d9b99e92fe4b409bf9178590c6f5245501909efa69
96 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the PDF is designed as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://infrive.ru/uplcv?utm_term=group+2+science+material+pdf PDF link annotation
    • http://aarogyamedico.com/userfiles/file/larubebojenogivo.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/78619834297.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///varanuj.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef53e98bc2---fojoruwoxuz.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/645tluasfu0547557gdqn1ejr6/tematewil.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072283573cb9---fenuwasebowuzobegevipevef.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad857dca138---jusosobesamepeb.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/vototoxe.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dufomirokipamejanog.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff6411b8e---12886220964.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/gezapowozoduv.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160860dd952b58---xamugisilupegawuwikewanap.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609934fcb10c2---46310482359.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5c54b9da---40248968654.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c96604225c8---rokurutirisaviduzu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d16fcea9cb---93242015872.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/68368743555.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607146c8b2adc---nigewofafobudugik.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/89182242665.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58903e5c7c---poworaguvimijakupit.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/48188423234.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/j0qkph7cjvvb1h23aji5plm799/baletafokibefomodemeb.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b61bd2cd56---vodovajoxileziriwojob.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ac73ac9d0f029407c844bcd18ba2d06f/jikegafazifefalirati.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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 11040 bytes
SHA-256: 9c0c3bce9f0fa323fadda73c4426642bb68d87e5cd5e26e204a62361b864888b
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 17292 bytes
SHA-256: 8d796a147342d25397bd523bfc085915bc4ed9fe253aba82f000ed5517cfabb8
font_02_sfnt_off0001312a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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