Malicious PDF — malware analysis report

Static analysis result for SHA-256 124a1be157b02a6e…

MALICIOUS

PDF

87.1 KB Created: 2021-09-01 09:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 321915ab54723b3e5ade15292afbf2be SHA-1: 478b131da72448a1e8e7fc18f5697f08f6957a59 SHA-256: 124a1be157b02a6e6991497a5f1d5ae300f81e542b592e546faa042fa2b3e106
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/42433234437.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430052808651853.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/najesarofil.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/68566228911.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/79584847091.pdfIn PDF document text
    • http://saam.vn/images/content/file/95472480174.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2818475f4d---rawuxarafexodukuzaver.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/rubovodiwoz.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/28260756231.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/eekk0rnos6ab1f3o1moiedcav7/26062384098.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/jemasigikogo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8f1ec4dbf---xikuba.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-11/images/files/68828664189.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/gokejutixopinekozogo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbc2d44dc3---banojabatabovepenoseb.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/gunajuwijefopifomedinev.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/25191448632.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/8837947fdae6d5a9e39e698a0771dd26/2961173156.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a26384ee---faxopokejuwawabezafidoren.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/wuvoteji.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/46917265359.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c139bd79d63---sisuzegujobameloramoj.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/35055371831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=midway+barber+shopPDF 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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10572 bytes
SHA-256: 13814ac5029053e55067236ef3577af004850662a6caa795dab044495c2a21ba
font_01_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9E 18096 bytes
SHA-256: e39f313ec4bb97040ea7e898155e99c96381ffcee53d4ebceb40248f38b5396a

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