Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7a3b0e94527bd7…

MALICIOUS

PDF

123.7 KB Created: 2021-08-02 18:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79a08599c849d6d0ecb45f367c89fba8 SHA-1: 0f79496a60a56783c2c6afecb9f088ea16785201 SHA-256: de7a3b0e94527bd79fd228a655de865e9807bc1895d3fdc26370e5fabeeee762
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute traffic to potentially malicious destinations. The ML classifier strongly indicated maliciousness, and the presence of link farm heuristics further supports this assessment. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/31748d342ddea13b17a3ffb0189febf4/lodekokugifupibuporise.pdf In PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbc80a6a8e---fifenubepukogilawupe.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/j974ka3fvt7gdbgb7covroaqa2/dotew.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc5714bd04---duvirasi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/iie115ect2pup76c4osrv9jgn9/4288210749.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a969c0e06c8---17576387114.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a6d652b4---debopusumurusi.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lilix.pdfIn PDF document text
    • http://lulanjina.net/upload/files/lefekoxuden.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/19400561976.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/91217839988.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/71787770888.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/69159491257.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/0janidfmd11e2lgsaa6p22pdd4/16608847950.pdfIn PDF document text
    • https://hojoairport.com/images/file/6004370482.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/16090403187.pdfIn PDF document text
    • https://soechi.net/userfiles/file/bivefi.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160794259d7b30---logamubidewaxivi.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/61365242195.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/15e809b98744eb0aa749e5a1268108f3/12686701773.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/61664651092.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3cbf606652dd2dadce8eae6dcea142cb/1663736591.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/dd6c0275fd15f338f6659a22c05c8be9/zisupebokalusonigavuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=99+names+of+allah+and+benefits+in+hindiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001a93f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A93F 30128 bytes
SHA-256: 63595bb6df1ce760d1794c944b8cd381d31cbafb7c25a2bfd333c89a94795000
font_00_sfnt_off0001478f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478F 18744 bytes
SHA-256: 141cd80813a99877385241f540cf51e5cff5018bee4ad8b9f03af553497f22c8
font_01_sfnt_off000178b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000190d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190D0 10732 bytes
SHA-256: 554f525a175e39921dd0f26928e3988d7d0c1ace45ba4ddbf8c83042444c3d28

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