Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0332733c11c53d…

MALICIOUS

PDF

97.6 KB Created: 2021-07-28 10:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b112d10ee28a6079940ffb6c98a39b1b SHA-1: 57ba60e8ae2c19fe41905871d18bc462be03a6c3 SHA-256: 5e0332733c11c53d2da435c893d354be449347297e07b0237a981e6775edc271
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The presence of these links suggests the PDF's primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://domeinbeverdonk.be/assets/files/file/78576096019.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac19af25c11---29176218977.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6f58c47d2814abd357770bb01f7ee923/zonok.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cc928f846e9---vumuzejenare.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060822261213.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/walobobubonekupada.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160834b85be52e---pomolegogemipegabuxu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/l9a5l66enimhcuasvdf04gee90/53475191375.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/14767715579.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16072014ca3c7a---xuvosatoma.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/32983534110.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2pv88m19h800upk7fjt81pnvgu/vevijufodopigebamubupa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1d48f5cb9f38deb2e147839f1ac7bfec/28623931391.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160964d1d55dc2---79986054454.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a029e73e14c---rubedinig.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f9ad018eabe99103f25dc42bad739c86/59014525482.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/30848995910.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3e1938879---95405329460.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/legatevifalo.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/6415831054.pdfIn PDF document text
    • http://anm-av.de/uploads/files/33857299614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+determine+building+costsPDF 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_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 10868 bytes
SHA-256: c3387365d605db4b9ae1acbc9bf7e673158968259e77d80a9e10c612c1c3c938
font_02_sfnt_off00014993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14993 17572 bytes
SHA-256: 70378b50789b67a2b1c21562484a806c0b26afe75bf8645cf0099e760a16f13f

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