Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a856439d950262…

MALICIOUS

PDF

80.3 KB Created: 2021-07-15 09:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 87f767fef414e2e7d7b535e6d4b2b682 SHA-1: f2116a9b0542d9ac606c4652601447157405f9db SHA-256: e8a856439d95026238bcadf3e6bd7642a9689367aaba6b9eeaca6630255ebb7a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=into+vs+in+to+examples PDF link annotation
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/7e0328fd7d8dcffcd3d0d268e1e20b2e/lotefunomatulujimowaxapo.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/93611325166.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/femabavebe.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sir2od7lp20ufbbjb6s4fded9l/gezebexonadasusef.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/zizozinekokojemiwaxelin.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/65629799504.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6352e4e6b3---wowalepinosabesotabemozi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849923bba71---66597580235.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dd81857fef4e8a13c93ada64b9b38afc/vudikelisalaxu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ll5v7jurdj4hgnionguk7nstm1/saguxadilituter.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b23862e1b---74011468133.pdfIn PDF document text
    • https://seripin.com/calisma2/files/uploads/73849236224.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/0ektnsqc7ie9t62pj7l1vntpqt/dovikarifapupaxebe.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060209075873499.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/60619242117.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0f4a0f54---36584973243.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/92027216024.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d24b8542---42862854380.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/xozozilikatukemujibodil.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/99632910194.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd2441edc2---rulorepotufubapomaduzazo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/f99bf57c89441ac852b96b616ef7cbe2/tazagozafav.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/kutatufajusuwejemopexatek.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/65955792915.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 17256 bytes
SHA-256: 74b25183988fe5ccda9c2e4d2fab59412a4ccd420872ea23463339efdf996b97
font_01_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1