Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3a56df458b856f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 03:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fb2a840e012e1cd5aecfdf9a63d9a96 SHA-1: d018b5a97275d335ce120559ff4d1e03b3b8db1f SHA-256: 5d3a56df458b856f7fe95e606ac35bc598a2a4178a7d06482147a10932ce287a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests a business email compromise tactic, where users are tricked into changing payment details. The embedded links likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c21f44433---85253478597.pdf In PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/70254073265.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb84ec428e---97258529223.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a5ec5740---15486221713.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/diduzidezobute.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/94746611547.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/mekitexifibivetovufumaki.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/turimojurojejinemodakad.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/vataloriwufedilubataw.pdfIn PDF document text
    • http://slide-bearing.com/d/files/53438960857.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/lutaxi.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/7419384589.pdfIn PDF document text
    • https://webaprint.be/img/file/lalukomekep.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210905123151.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/pemalanuzawitikuriranek.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/11957411448.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/5230323142.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/53085549861.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/9673765337.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/46042742540.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/zijesunadixagiborejopitor.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9f1fa0450f1b384299bf9bcd7c780251/pamowimuvonexa.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/36768277640.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/62589808812.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/25656502512.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=grabar+audio+android+studioPDF 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_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 18376 bytes
SHA-256: b06096dff4468bba9edfaf04923a534148d4ffa386973dce3e3e72da5b2902c2
font_01_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 10340 bytes
SHA-256: d81871d4c90c54d05c6132ba3c565e0f0af8c90d099e0b052c57c53b17770580