Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ef1ed02fde25ea…

MALICIOUS

PDF

82.0 KB Created: 2021-07-03 00:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32e65dde2b7b115b596c38c99c4bed6b SHA-1: 6e8f470038182ae721faff5ad2bb15c52dbd5263 SHA-256: a4ef1ed02fde25ea1e4b42b3fb17a9ae5503be6d64066ffdb95e1113dfabb84a
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm hosted on compromised WordPress upload storage, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting malicious content on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f71d433d3d---45689461534.pdf
    • http://erdivigado.hu/userkepek/file/33810141186.pdf
    • https://tolgyesvolgy.hu/userfiles/file/rilapeliwivij.pdf
    • http://robedecreateur.com/img/files/bonotegopuwofaveb.pdf
    • http://bright-mineral.com/uploadfile/file/2021051602471570.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a317fd4271b---dujusugumonafibolenoga.pdf
    • http://svsteinfurth.de/radsportfiles/file/6928599936.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711833cd9ea---reguwir.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/k1mpdhieaia7ludfrpia75ehpb/29914732249.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/84q7eo16f5teap3lb8qmtovq3b/70257176662.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/ef4d468da9ce35f62d9863aceadf57c3/dirixiwapaboxasavozo.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b2d113a64---68896271541.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e54e5863---kagotedivudimepogokarik.pdf
    • http://hoanggiaphatland.com/uploads/image/files/87846988404.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/95475295635.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3b24d5068d9c9d32a4330a6bdd827aa1/kidawugojali.pdf
    • http://vejwun.cz/images/lokejujaxiwitomarube.pdf
    • http://smflow.in/admin/uploads/file/zipirikowulexugun.pdf
    • http://asokmontridental.com/userfiles/file/lovoxamuwobeduwapadi.pdf
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/77300633206.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/46576161508.pdf
    • http://africareview.in/userfiles/file/11158199786.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/da3b04703ceabfdd033456851d51857c/81865802692.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fp1r06dmuv0d34656un2o9ih5o/dakolifarulibunatelifoz.pdf
    • http://chothuethietbi.info/img/files/girewukon.pdf
    • http://bensonlandscape.com/editorData/file/sijat.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16083f4d151fa7---2324586803.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/jifobebiguxaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=cool+particle+effects+minecraft
    • 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_off0000db0a.bin
542f97642f8e5a6c03165dea1c5e855afb1c410c495a655f660152a4bd0991c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 10672 bytes
font_01_sfnt_off0000f381.bin
d20778fb9745e1921243f05e4f761ff6277ef8fab47273f79099d6d4740eb126
pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 17632 bytes
font_02_sfnt_off00012229.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16792 bytes