Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac18e34c520d5bc…

MALICIOUS

PDF

75.2 KB Created: 2021-08-20 20:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ca940b03c7ff63194f619cb6c712b943 SHA-1: ca012cd03bfc187e473dea6427bcfee5a3a25608 SHA-256: 1ac18e34c520d5bca34df6722c1c1b5d906a2709c7351171ae4b2d5853107b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://artospace.com/pics/file/76024140418.pdf In PDF document text
    • http://www.77ice.com/upload/files/romunavemize.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/65109567427.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/pefusosuramob.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/dakurojujivif.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/11605732593.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf4088618e---90145155547.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/nituv.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/dukofuxakewowotudopejufaf.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/mubowizimawopogutodurebi.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/880eargm5gni6bufsv8opmua52/rodogafituxewu.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/6fcc3854ddff7f2d7248e7ca9c8b4047/zerizapatenegumojasunune.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/79813467401.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/38127774277.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8f64389ec7f5f4a15188dd4443a90b77/74057455312.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/29564302821.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c611866e36---28203358769.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6be661ad---boxeragew.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a7346b5d4c4---wiroxovepupefosogexodaj.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/86857maei2ja5unidjg9ijmtn6/35644826369.pdfIn PDF document text
    • http://yuhongzg.com/d/files/tesitozewapenet.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9727c75b864727afcab4c2726710a6f9/sofulegogozaxagozataper.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/3876219028.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/71631387458.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/85659374260.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/19628358969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=benim+konu%C5%9Fan+tom+hile+oyun+indir+clubPDF 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_off0000bfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC7 11208 bytes
SHA-256: b70eb5d3916751b1e60391a51ef74d19a84caabd12e5db4c271e43cb2959ecfc
font_01_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 17568 bytes
SHA-256: 2ec5f715643bb9098418f98ca8e6c42dc2dd6a245664875bdcdf6489eab35d71
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1