Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37f88a81a55ad3f…

MALICIOUS

PDF

89.0 KB Created: 2021-07-30 04:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20ec1c42b456fb28525d5912eec90bc6 SHA-1: b856955568051901dc228b8317b1589dd845460b SHA-256: e37f88a81a55ad3f931613bf10b7b552939d13f9a86f74ec68806b8a89308531
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://perfectsextherapy.com/public_html/userfiles/file/91480616052.pdf In PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/71c614403df45109656de1917e617f7e/89361680132.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/91a838a881fa962b6b383b8e20c67085/vuvupasazukagub.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160943e19bd184---99068988594.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d601c4be31---76215218585.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/23169010648.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/53894671716.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jncmc1dd1e5devn8uch483ik4c/vijatovokiloziraxobaw.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/vubuw.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/g9cu1k2c3co43m5a3scs7lh5q0/29882144922.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607228755be4e---xodosozeturikuremeb.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/nipig.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fd027eba1197c1fe370b697fe02f340e/luwoxarelafekoxibafek.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/80609804680.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab44f1869---suxifepokezu.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3acfcd26966a6cf98230bcca0000d345/vebafukukisimubijebo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874715a722a---fafojabinusikesepevip.pdfIn PDF document text
    • http://fgosvo.ru/files/files/47974977948.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/ludamitunukezub.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ijsnh89828sc4jh9vj1laokkin/tijevugi.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/posugepuki.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/lixikebanidokobit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=quran+arabic+and+english+translation+and+transliteration+bookPDF 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_off0000f7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 11040 bytes
SHA-256: 24dcfaa358c9eebe93060cfc9d2ccf9101502526fc143acbb97441fd1794f934
font_01_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 16980 bytes
SHA-256: f66aa1bafcea4cbfaeb92688d44fcd81a072c9dc3fa8d4e2d6b71163ba37afb0
font_02_sfnt_off00013d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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