Malicious PDF — malware analysis report

Static analysis result for SHA-256 7748f7f13caa5627…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 04:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85903394a48205f1dcfd78e396c4fbe4 SHA-1: 84fce5d2a9a2e9dd83402a59fcc7aadd43857438 SHA-256: 7748f7f13caa5627f372217d297f48e22a2969a7133379d72e4341f9acc101a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple unknown URLs further supports this attack pattern.

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://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/mim04g83ca4thhp720s8878lao/neduzop.pdf In PDF document text
    • http://celeb.huh.hu/UserFiles/File/13052369724.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/kilosutegofo.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/levebefekozekobexim.pdfIn PDF document text
    • http://brenderup.ro/mm/file/sorumagupibasun.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/sogavivofajapufiz.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/zajovewig.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/purapo.pdfIn PDF document text
    • https://pqclass.kr/imgs/file/99423178539.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139995683f8b---bedilopibawop.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/60964256443.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613e49418d565---dusitatorifove.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ac78e8082---87572444284.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/zudavibefagomojobupelexar.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/kulifozakisusotebozaketip.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613887ded4110---mofavebirolobabipo.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/mogowes.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7ea41581---punubenoregekonimo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/pefuronu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/91227687862.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/86325432130.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/82408190535.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/mabatesigi.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/jenabovapuzisawosufipizid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=iphone+7+not+receiving+group+textsPDF 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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 17784 bytes
SHA-256: 04d9520e85262f78bea029cface1cf3b8aae2efae9f0aa99cb49048ab4d3f37c
font_02_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 10716 bytes
SHA-256: 68919b841b6ca5c3a16204dc15dc3983b196c47bc146843615d6c088a3131752

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