Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1191c8a84551ea0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 18:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 412231137dc540ed50d8857511a7cb6f SHA-1: c675c47908b70709b1d5fad64dabe55afbfc0720 SHA-256: f1191c8a84551ea0c5ae12aaa6ed85a1c17c669a57bba26f3e6027dde89f66bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final malicious destination. Heuristics and ClamAV detection strongly suggest this PDF is a phishing or malware distribution vehicle. While no scripts were directly extracted, the nature of the link farm implies an attempt to redirect the user to a malicious site, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/js2vod5dkevmp9722rgqg6tnk8/fezal.pdf In PDF document text
    • https://bursac.net/userfiles/file/90360501319.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/lukakakujanaduxotidugexaz.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d5c02d6ac6357142850011698538a15d/61762032291.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b9df26d43ee3103bb24caa439914f1b/babekag.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/65198162214.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f143b4e78b0---bojajamoz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/r269661ke8o7lvc9ob3qckjuel/tepuxu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7dbf3ff1a---poxanupuronavejalewilav.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f79262d3---jaraxod.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/59378686138.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65e5b8523---kikokapopozadopukolax.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/neretuzutusopara.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/18540696876.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160859fff09be3---90051475776.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210611153013_8ymw22.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/29842187495.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8b9d1017d60fce5b4a8b95bccc503bdb/doxivaxavivowugejin.pdfIn PDF document text
    • https://izometal.net/mm/file/39600222081.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/70528933270.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/2809206333.pdfIn PDF document text
    • http://evola.it/userfiles/files/mixixirobelixuxujuso.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/tf1v3lri4f62epgds9g8bg4514/88021529973.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da91016b86---99770785140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tabela+nutricional+de+alimentos+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/681ae77bec1c6e3729d21cb11276b221/biwugujomevo.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_off0000c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 18356 bytes
SHA-256: fc69ed3dda1088a333a3d2a96eb05b15890c5e228ec9720c1fbf74b1ae2b75b6
font_01_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F2 10984 bytes
SHA-256: 6bbbfb32ebf650c8c1c8b98df6eb09aad9f671a38edf7e120afc92dca9eb83dc