Malicious PDF — malware analysis report

Static analysis result for SHA-256 525cbc38405acf66…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 00:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4327c073879c9f183c09d751bc4de7ed SHA-1: 08317ff92292f6c5437e144aa91260b49e1539f1 SHA-256: 525cbc38405acf66e9f8a1f7ec4b448ebac16a2775b4e6315ee129c5cc7da284
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains a link farm, with many URLs pointing to potentially compromised websites. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's purpose is to trick the user into believing there are new or changed bank instructions, a common tactic in business email compromise scams. While no scripts were directly extracted, the PDF structure and link farm indicate an attempt to redirect the user to malicious content, likely exploiting a vulnerability or leading to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.sun-green.eu/ckfinder/userfiles/files/6103787015.pdf In PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/nipufuxapuxoji.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613246602509f---17315391044.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/vojadovusixuwatedi.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/46278085361.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/40574854688.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/5dv518r776jnad56iogufteum0/2525819443.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/52915689273.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/57140226395.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/jofonoruwijigunatanilo.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/majutomuvo.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xawig.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4f3ea3aa---zadodesubolisaner.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/74105617967.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210906_E212DB293E8F82DD.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/javadakezikazowezogixax.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/7378114492.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6c17ff5b1e09d3fe3a5bb6d01b63da88/mapufasivekorudemu.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/67273340415.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/34817258984.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/78868844396.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/pimup.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092005512818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=instagram+private+image+viewerPDF 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_off0000bf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF57 10532 bytes
SHA-256: 64eede93636a2aac9df4e46cf4b3be1ef9db61a8904dde738ba84095d8994ee9
font_01_sfnt_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 16080 bytes
SHA-256: b3de5e601d2395556f96dd139ceaaca4d41c2159a427aacba28feea4310e7e50