Malicious PDF — malware analysis report

Static analysis result for SHA-256 365c11a0e494fda8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 23:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bad5191b70dce43428425867146f2275 SHA-1: d86e06fff1de8f2173ea3b0a2273bd28ab944701 SHA-256: 365c11a0e494fda80aea9a6c22abcfecd6ae12d60259421ca87ea1493f1e0567
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a downloader or redirector. The presence of PDF_JS heuristic firing confirms the use of JavaScript, likely to execute malicious actions or redirect the user to external sites.

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
  • 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 http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081c38e322df---wuwin.pdf In PDF document text
    • https://nikosdimos.gr/userfiles/file/linexatatulipuviju.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3b7eb428---7319890440.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/modokagapomip.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/fujuwefepaliso.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b98189ab---viwonomejizituwuzi.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/zonesuporubanikisikezu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f67a81354---92872314622.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50669aa1a4---votixoramufugar.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106060351.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c6a5420b3---rufasosixuwavosu.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/o2bsji5qu77e23p1518t3e6jss/zaruxod.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/nimetakibomogefip.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/45652668640.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/42d3155cbd8ac56ad597247e4b71d868/popemapuriga.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91d395918---4998845027.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/vavoxesa.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/numemefow.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/42933243086.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/98620879520.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292e6ba3176---41778840048.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/38447560621.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/nisokapalezixazot.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/kelonazapefixiru.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/69542059414.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ios+objective+c+tutorial+pdfPDF 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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 10896 bytes
SHA-256: 8d0f5a027eac262eaa0dcd298a8a6384938fc4a01e4ee0a3bf3d487baab92d88
font_01_sfnt_off0000efa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA6 17852 bytes
SHA-256: cd4a07e9c9748ac547308f66fb490c7c3d38b785844464cda5ee4efd8b19f4d1
font_02_sfnt_off00011deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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