Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ee15603545a838…

MALICIOUS

PDF

94.2 KB Created: 2021-07-01 13:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e7ef85b069e1fce2d16c2199e8339d99 SHA-1: 27e534fb2778bdc024ec5f244ca206c439ff81e7 SHA-256: 41ee15603545a8386e939cae7dc6d85ad54b0fc5acecc98a0a0a1f3569ae428a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs and the overall structure indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/55c95e5bbce2b98f355036a95ca17b52/82947210912.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/he5matcuon6gqg87qdop6lk831/39373827242.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210628_4E5FD164DDBCB67A.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/worarovonewupizivipoped.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dezarigemafu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb94e79df---nudinoxesiwotubi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/33775958623.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/r0spmddmj5tip4jr6ua6gfdvab/93874136824.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/zadosakipel.pdfIn PDF document text
    • http://sparkpro.lv/content/file/pazadulalumegebiwugavudej.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/86028682811.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c3384173afed0165b20f83528448344c/17940995038.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/212b151a85575aeb45673dc73d3d7c96/jawarumogowo.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/mobokenibedel.pdfIn PDF document text
    • http://short-story.ru/upload/file/30296102226.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/dowadafazomajeb.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/fuwenezinebebibuwejipi.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160942fdc8f34b---19456287331.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c4f93cdd1e89880bc5801868b9f8ec93/nugefotigekakigorekipe.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b389ef49b---palob.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc6105f02b---mivunabigibu.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/59513458445.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608b559a27324---55206418587.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=section+1.1+what+is+earth+science+worksheet+answer+keyPDF 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_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 17176 bytes
SHA-256: 84ca7dd14e48e69179e9829f6c998feff3b4fcc443249f8614fedd993048d247
font_01_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 10768 bytes
SHA-256: 91a5ef6bae9f196e85dcf9f083aac945a321a824ea5f6fb05b67f17f0ba21b97
font_02_sfnt_off00015353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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