Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdbe44dcfb48858…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 10:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41be0afdcaf322cc43b866994ec2e460 SHA-1: 119f28739cd1797fc75ccf356c491834f0fce810 SHA-256: 4fdbe44dcfb48858942afde3c9e3da9c01f153cc894e9581b8e23639abccbd43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smidgel.ru/uplcv?utm_term=sample+of+written+project+proposals+pdf PDF link annotation
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bef43f07c---40396529165.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765f7a05e85---15657438336.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/65500220191.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021082614455612.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/fotapotosuxamekavevipibe.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/krar7ut073351qtu0o35cmg210/80341078428.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/91077413650.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843ae8afdd---metevo.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/debaloxoti.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/40363675647.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/27603331585.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12840399143.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1419c88ced5f799fcdc545162889ad64/60283001102.pdfIn PDF document text
    • https://thepainter.asia/upload/files/27744923468.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/gugenewomopejo.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/48b2dbc557eef54cb151527e926b5b7e/sobep.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/14ed1c006d6b4e66653bb45fc51f08ae/18782169436.pdfIn PDF document text
    • https://olterus.com/contents//files/74796913352.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/sitesoxaberida.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/30497437535.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/29680139414.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/07df840106bfe6c3b2c8d007459ebd18/sedojedidusabukaxuzirese.pdfIn PDF document text
    • 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_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 11072 bytes
SHA-256: fd1063f877b3e32f81ee13a460362bc1c2e0d15c77b92813e99e152de505ae00
font_01_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 16320 bytes
SHA-256: 5eb7ae6848850483b88ea70eee655310f66397b2f3ac591fac689b75517cdc67
font_02_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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