Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc94cd3b27eef26…

MALICIOUS

PDF

80.3 KB Created: 2021-06-25 23:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2802808df20c81f029d347bf85816fee SHA-1: 5c9aed32aba2d1b213d79c4890a2ecc76d36d62f SHA-256: 4dc94cd3b27eef26f9265bb1b61082805954fff93280db5013e4a880800e26df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.allatpatikapecs.hu/images/file/35685924271.pdf
    • http://aftckwt.com/uploads/file/sugajijizulawavet.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b0c41230c749ece72206e3a4976046b1/venojipasowilolaz.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ade689cbac2---zogikilujadaxinosesobari.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/reviretefowakexiwedomeje.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b75ad1f4---43530529848.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c74c2319631edadb71d6ff0954418f56/70200823086.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/e2796ec14c24077ce655ed925ac2fbeb/divelepupadikupakosixodu.pdf
    • http://edwardlankin.com/clients/86087/File/10376000737.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qtdvf2aermetd7rgeou1mg7tds/fowidedojegitibo.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/683e29d1c9e223c17f43d71d2c6f7199/vofoxawavowixarifema.pdf
    • http://hanarotalk.com/userfiles/file///75554128334.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/k07uj5u8r3fdfok38ncf5lhu48/vajotu.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3461342b07---76194301439.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f148d1861b---66597157046.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f4d84dd5db51b663e776cc67741ca272/28609066670.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/paj9m6c10o00593sk4uk0setr0/70237000903.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/209afb8132da239dd49d15f17e59bcba/wetuzil.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/6011e34b7cdfd56917416ddb099d42be/kuxabarewojosonapasebesex.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609821f0f28f5---16811223241.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a02b27c0---85739605208.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0ea6ed5fa744a0f6e94eb94a6e84eaaf/lokuseroseke.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f14d883f---78267081859.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sun+and+moon+trippy+painting
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67a.bin
c1afe39a089e3dbc43725c14ae252b57b5b12558350419fea2bd31be99579e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 10676 bytes
font_01_sfnt_off0000eeb6.bin
723af61494e940f29a82d2d14e6c0da42163090f6a7838c323f695f30360727e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 16844 bytes
font_02_sfnt_off00011aba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 16792 bytes

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