Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d40bf9f816e4e6…

MALICIOUS

PDF

87.4 KB Created: 2021-08-07 06:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0baacd97dadf1d7480c2258ca22112b2 SHA-1: 8bcd7624a9468d985a166b8b3719bc602cbb9c24 SHA-256: 72d40bf9f816e4e61fd1762d3ef2fed73b7b6bedba4a12eb6cc84b64a615043c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://garglob.ru/uplcv?utm_term=what+are+professional+boundaries+in+care PDF link annotation
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c08c25865a6---9795523002.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/gixugodomitar.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d97acc2a---24675270402.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/24/file/96418707655.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0765ad9e---gekenaregasapiwakewuxa.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c140c096498---56603165468.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2875e28633---36348274476.pdfIn PDF document text
    • http://recrute.fr/files/files/63236043589.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/suwijomuvakireni.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/b1c1bae6f890b66007041e8074f421af/sodikedujuvivomamilutipa.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/66331293905.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/6801860337.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/24792826420.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084219121009---58115259312.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a002594d438c889fccda6a3bbab6f1fb/nidusafun.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/17303069033.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/tewavemukufumowemedug.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994ec15c74f---tasusutumi.pdfIn PDF document text
    • http://martonelektro.hu/files/file/vuxomipeba.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/tevujimave.pdfIn PDF document text
    • https://majubesar.net/contents//files/ropegoxusovusakusarezome.pdfIn PDF document text
    • https://jagominum.com/contents//files/26346927970.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b61bb12386d---77348017424.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/xipezaziku.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/64022866190.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_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 10948 bytes
SHA-256: e3e924813ce6cd814b151d3986d3285572a0ee810488ecf5eda9c997650bc72c
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16824 bytes
SHA-256: e5ec906c4443e35a8f5115d1d8e31a6d5cd025efb7152e82813984dcdf24146c

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