Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6f1a601a1fc122…

MALICIOUS

PDF

90.8 KB Created: 2021-09-03 20:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f16f6c1b2ad13ff8a20a203858ebefe2 SHA-1: 15fa0aeb699226ada6c43080c7d7612880da7af3 SHA-256: fb6f1a601a1fc1223dce224ad8e76eb03fcf104a9e3b0dad8f404f1ad384dfcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dentalrud.com/userfiles/file/bevirevesinawaxuguno.pdf In PDF document text
    • https://xn--nmqu14inmf.com/upload/files/dinesexunumi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mbiqr4sm275ipnj18tslkge2aj/18887252093.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea55ae6647---5234882114.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/55e7c6ckcsm4ruoti0aq1p08id/84377036324.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f928461a---95501240664.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/wotit.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2c75d6ef3e79b9d2a85f710151262290/xisexumipedix.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/ramusamomevowubafav.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769a3ed50b5---kujukosuwetiwoxezamuxun.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607628ea4948f---15677846574.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ca1a1d0a---82432309220.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/jawinelareru.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/jegudodipakolovukulof.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/71f5d45e6bfbcf81dc79cf4961fdd25f/nupoxopanodode.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/8120451395.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41a18c22d---41380416044.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/52479c292520a5d9efdbf5084b921f22/25586092648.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/jimotoloxujafezu.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zasolepolu.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/zazovimuxev.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/68291001078b7c2a83105dd10d85524c/xigeminem.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/mowisomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sample+of+a+partnership+agreement+contract+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_off0000fcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF8 17884 bytes
SHA-256: 72a6ab2648d66f195658ba988564c5f8e7f769f456c0db527ed88e3d3d81cf45
font_01_sfnt_off00012b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14381 11140 bytes
SHA-256: 0c3bce2a0df66d044d6c999074577c8195871b1db6bdc70c2425cfba0a076cf1

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