Malicious PDF — malware analysis report

Static analysis result for SHA-256 0478e13106ee784b…

MALICIOUS

PDF

89.7 KB Created: 2021-09-06 14:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8497e011b885677fbc85bc016d538f8f SHA-1: 8004986ad5545fc5673d5808b819e4c12531889a SHA-256: 0478e13106ee784bfac7c71f404a03def8754ff8ac0d225ca9975a00303afd0c
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs that point to compromised content management system (CMS) upload directories. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution scheme. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://csc025.com/userfiles/file/20210708091508_nrlguz.pdf In PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/657ba2b8334ed82fe7fd83e4dfd1c612/bofivarenelotawisafax.pdfIn PDF document text
    • https://plasy.com/uploads/file/xaresubizediruja.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e07eb5a5f---13110428902.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/rodemewuvide.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/63762538191.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f8a8d5aee---75781261270.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/nomigozi.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4kefb638o82tpr2o9sob3uafk1/bisojukopafofinezisevip.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808be36c7ad---70941880488.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/62297663904.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4o626tci7r30fnqmv93psqlo04/vabunezezi.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/xumeniroguvepikexe.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/guxokezifam.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/dopumafaguvakorura.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/jujipitef.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/85596458559.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/61894915454.pdfIn PDF document text
    • https://tuinvandecruys.be/file/wugulotu.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/romaduwefazudeg.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/71170698122.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4709b607e---sigonivomekebajuw.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47ec2b2f5---60119795843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tri+fold+brochure+template+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_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 17288 bytes
SHA-256: e2bfbd59a81601936eceb3dcc52a7f2f08b63412e0e33ecce6016a0d66e5e2a2
font_01_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 10816 bytes
SHA-256: 8d6fc134b2d074a6e0fdfccf52b21b698ec035354f1fd8275eea29db8712e13b
font_02_sfnt_off000140e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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