Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b42c66743ad323c…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 20:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baf574a8dac2c9527a0328278ae73416 SHA-1: 82130529ae8a17268514198124fb943f8d022425 SHA-256: 7b42c66743ad323c3ee7c9016eebaa9d02f15a7318cc0ae2aff3374fee872d69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=matrices+practice+problems+pdf PDF link annotation
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b35ce65020d8ad95a120b0e7de57c7b7/musazexesonexikufis.pdfIn PDF document text
    • http://kasargod.net/uploads/file/51732231572.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/mutaxutona.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbdf193a3---98681753892.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/22360775794.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/27136323652.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160758cd91ca61---14252826458.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/kilukitazaduvi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b477a7480f9---rebimemizaxikakim.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/jaxugigomuvomo.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d0a6e14345e47c69ec82d2bd6e3fa6ea/madariloxodebazurokubejal.pdfIn PDF document text
    • http://synowka.pl/galeria/file/lupekosubugelibijisizepi.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/22614427068.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1f599c7511ef4acc1c9e5dd80d6d0566/99242671308.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d16d29b5b5732e197f1e407cb2016d25/zejasakuguwijipufutox.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/vumibelude.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd38d7809---49457360777.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/vibumenerudo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/400faeda4cd718eff8644b6c16d4b39a/galigabe.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/33304424363.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1afmp2vvlh6mi6kfggh3i67vgm/jujedur.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/dozuziruvarajuviruvafo.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/7171381586.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/82037679589.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a13db0d26df63f39fbab49ea8f9696e8/37447025536.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_off0000c78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 10808 bytes
SHA-256: a7529ad8680a1e57d6fc83a30d8c396159a946c046a36efe5fb41bbce447553b
font_01_sfnt_off0000e044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF856 19628 bytes
SHA-256: 4113c9f0dd11b89d7a23cb24339a7faeaf199d4173957ca9aee88011ff757776

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