Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c6b87097af6dd1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 16:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d922023a9d7c791069dd6179a8bc223 SHA-1: 72bd8cce83dd8a8f786d1655afaf4d6514e077dc SHA-256: e0c6b87097af6dd14ca2a4d83255f24704f56f21c5f033b292931c4e98b28463
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jufivobitujapolabo.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614572d702157---47692845725.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/ritapub.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/45486077056.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/susejonezunifawejud.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/24123833404.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/valanowepafalugozime.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/zavozefunipud.pdfIn PDF document text
    • http://etnorom.hu/pictures/tijetuluxojugegepoz.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136773382ac7---86923233111.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/47151070169.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/14346840424.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/sugebi.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/vatepolixuke.pdfIn PDF document text
    • http://huiking.cn/uploads/file/162125148032.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/womovafufake.pdfIn PDF document text
    • http://chinalabware.es/d/files/volaresesali.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/b5u97alfgv2668fk4n6ra5i8gj/98092327898.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/97947666911.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/56457599475.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/38266423309.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/jorarirava.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161440cce7b96c---jelunoraz.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a9c441da---pejinurelimarazeme.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/54695554689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+test+proximity+sensorPDF 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_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 16900 bytes
SHA-256: 89059dbd3e6050381abd9449054fbf6288e862f72337b82cce60dd7de32b5b79
font_01_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 10540 bytes
SHA-256: 4b6f51c27cfc7a3f24320bee3be588096cefc1d3f7382fbb7a2c1b46d6191441
font_02_sfnt_off00011d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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