Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9df2a42085a072d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 19:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6ce6337f7b546031beb139e180a2dfe4 SHA-1: 343bbca262e373936dfb74febef5dbeb8856866e SHA-256: e9df2a42085a072da805964997eb1ad51fc16d8960aaf2b37d9da87986fc2c1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicates a phishing or credential harvesting attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=live+streaming+portugal+vs+france+2020 PDF link annotation
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/5716746705.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/fafumetopulude.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614224db05dd8---37971955307.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e28a28b8ccda37afd8cff65a3c819bcd/vobop.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/xamivorupolor.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131af5da390f---87340497961.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/bupan.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/jelikizevemuse.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/17810135407.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/88690437566.pdfIn PDF document text
    • https://laps.pl/userfiles/file/21128854608.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/14955138954.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/vedetimozuxu.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/13509453954.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2100e5f4---fumomedafavub.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/fojurara.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/rezudegonejoxamevek.pdfIn PDF document text
    • https://breedlife.com/upload/files/85537253994.pdfIn PDF document text
    • https://soechi.id/userfiles/file/vazagezakam.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/mafajiduninu.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/nexudilipiwo.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/tovilolubad.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/83333511282.pdfIn PDF document text
    • https://csodamalom.hu/files/files/nogubigalida.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/97721283539.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/najugewar.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_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 17476 bytes
SHA-256: f734d53c4d9bd08a48b301706a9b7cf2f654d27e23c15f8df5a33dcc5d8b38c1
font_02_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 11188 bytes
SHA-256: ac6d5cb32d2553be07ea64a5c46adcc038912f831f34a565a4904ff6d0f495c0