Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eeb4f7ebf8fe7b9…

MALICIOUS

PDF

88.8 KB Created: 2021-06-29 08:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0aaea60367308857997b56bcce50c368 SHA-1: 389c2a4b90de1b4da14115f8f6a2de3cc601b90b SHA-256: 5eeb4f7ebf8fe7b99e0c8044e5d85b08e66dab6f3821df5617d65202785aaa70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/eb21588df2837d0985f49d27e7785127/90422766679.pdf
    • https://tedvandergulik.nl/userimages/file/78415002111.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/49bffedf5350977cab2435c408723f22/vijupesunumarugoponimos.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0382b610---gigemumewawapesakori.pdf
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/pefusirepol.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2168e78023f2c61a1ae68c04c2034a8a/tuwefupol.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a80de87fed3---45127517533.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n0jt2ucv04jg8hab303hg2aid6/gumonawiwozowokuza.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/7l421keu51et5g96io88tksmt8/75740644037.pdf
    • https://sport-jicin.cz/dokumenty/43122229926.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/46993873985.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ms1tm04ij5ilr9kjf7t4jl47a4/dowelaxozibugas.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8c800ed66f2ec08f56f70a57277a055c/lukozexixigizisi.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/5to761v8msioppd34l05judocq/70236907639.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8a051bd4---82669127220.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d52900aba---48045699848.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/mujanum.pdf
    • http://sns.hu/_user/file/nanameravagimuvupaxozis.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/88350422013.pdf
    • https://bursakaynak.com/userfiles/file/surapavinewova.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/fc30de44f3c1c166efcf835a0a7cef72/tunomobepazekanawatemi.pdf
    • https://aarhuskortet.dk/images/file/kidegegumo.pdf
    • http://sbkf.org/files/files/23798257703.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c4721662d---19405171783.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825b42e4ecf---9876109284.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sample+fill+in+the+blank+questions
    • 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_off0000f80d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 16792 bytes
font_01_sfnt_off00011024.bin
f82cd3785c02f9c755b30ea5bc35027f6cf880ded5ee3499d42af6146c4bb409
pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 11076 bytes
font_02_sfnt_off00012979.bin
204f1f94a585218c39c81641d076b3fce1461f4a6bfaee230a7144fd3fd0851b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12979 17104 bytes