Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb79d101a72e004f…

MALICIOUS

PDF

69.4 KB Created: 2021-09-04 09:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d55cc752ad013594e82faded3b78659 SHA-1: b77eefcf49c1b25d28e67d2c78eef7805d307ee1 SHA-256: cb79d101a72e004f8ff0528828e9fccc2ff059303310e415964be085fc5dc1d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=mapa+tram+alicante+pdf PDF link annotation
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611c82bce0b18---51528410709.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/83674759855.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16088269e8b531---narewikabige.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/vikevir.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608714a4d9af7---54652569548.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/1627f2be0594c772e7bc683b328b09b1/vawolumowukulixegazolupu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/n98ih344kvfm86sriplggsome7/sepotemolinasumola.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/33487492012586224a751a880b1fbc49/8676936738.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/kuxuramifevanizapa.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae6a1c3f11---gubek.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/vekibafila.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/39871295085.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/71806449739.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892fedc4b81---66725095612.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/tuxubepisimiditevipom.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ekaflrqdebr7i2dk6sej2t85ms/2710735182.pdfIn PDF document text
    • https://lesura.net/userfiles/file/79515934754.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021082614240569.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/71410057214.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/mijanawasagom.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/38913389548.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/98016894593.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/59927172115.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_off0000b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 15380 bytes
SHA-256: 0da180ebf8f7ab69ea9ce68dc5306225ef0826e215cb1da0ed9fac95736a8ba4
font_02_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 10484 bytes
SHA-256: f573485adb5693d6404934727ce2e94123e6005f62baf68a3365c1bf4569da86

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