Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea20d1ab3f3dc7c0…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 03:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e063f46e1edb757a154d8741907bb6b9 SHA-1: 571396cf2023eca0b33e0fb5290c9faaddf8bd8d SHA-256: ea20d1ab3f3dc7c05fbaeab86af9739d531206584ed2101061c6ae02585f8d5a
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm on disposable hosting. The document body is unreadable, but the structure and URL analysis suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160de47874268d---jupuguwomaxebosu.pdf In PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445fd082a4---namofonemuganuwa.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/xagaki.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/mewutojomeganog.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fcc61b08e---mukiwipebaxuxusu.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57765129527.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/molimibuwiferapopisa.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p3qobnt2c25gs14npmvikd6sjj/wogodurufewiboxutazek.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/bac57b26f69fe9aa23b254d714daf620/29951464848.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cd5b7cb3---74377782548.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3bbae99ccd6130aeedeeb99a23a582c4/88279264324.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/zomidikefojewotekibifexe.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/93216671829.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008821d6d3d---binolunoperibozereji.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823abfebeb6---pejolopuvuv.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/fupewigosexodozagevina.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f4de52d93---kozorapobilob.pdfIn PDF document text
    • http://hkacca.com/userfiles/zopuxivetalukareralu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/57091451181.pdfIn PDF document text
    • http://c-amc.com/upload/files/kisunupizoko.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/kuritutogovefejod.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/10473364545.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/72507340596.pdfIn PDF document text
    • http://christopherdallo.com/file/digoritexilulobadi.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210905_9_22_56.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/14872112809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tratamiento+urticaria+alergica+pdfPDF 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_off0000cb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB68 18224 bytes
SHA-256: 735958a9406028181793c325861d2df738b4b2170458249e2d9aed9323aa8b8d
font_01_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 10860 bytes
SHA-256: eb2a031b7a039e470099ee3774e731c682ae6f08108f6b9b053e4f1d5080954c

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