Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ffb404edf5e704…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 18:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5901fba6e4cefefaac4c3c2dfd3b27d7 SHA-1: c5eaeba652c18a35226a054045912d2651454ca1 SHA-256: 72ffb404edf5e7048fab777722d8df5db84230cac91716138fc1c6d9d5824c35
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristics point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://oniceh.ru/uplcv?utm_term=pokemon+gold+pokemon+cheats PDF link annotation
    • http://ufcnagykanizsa.hu/userfiles/file/38224914101.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/1206455132.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e63784f5---seledipafupoxitem.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/k3kofu5slish8sjok48ja8rp8o/tewamiletesatejologoku.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/nimejux.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/62453276254.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/kuzogokus.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56644268128.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/89310342641.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/3750354a61ce41da70a3f01c48d7dc17/kasidotemojaf.pdfIn PDF document text
    • http://espwireless.net/uploads/file/fukuxazilenigig.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/30714178278.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5c591034---52940868047.pdfIn PDF document text
    • http://school15-tyumen.ru/f/85335921999.pdfIn PDF document text
    • https://serka.com/serka/upload/files/47212453260.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/kanovaxokotuj.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/jubivepuwovumomo.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/5936657729.pdfIn PDF document text
    • http://effektfilm.de/files/file/94179186504.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/gujesibogonidalikokenof.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/58083052728.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/78974988985.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/84321790690.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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 17924 bytes
SHA-256: 0ff054877b9f8f8ed27518eea9168e26361f72e7639b20487c5612a17a575bc4
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 10860 bytes
SHA-256: a5bb93e0640087c5b022155d8f4a808c32d34b69afc462f72430bdf5b3b40bbf

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