Malicious PDF — malware analysis report

Static analysis result for SHA-256 973dbc0c50e9a2d5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 00:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dc0ef6e61456b9ac3e52cff5c17bc97 SHA-1: a78060b38740864100418144a3634741dfc4ba03 SHA-256: 973dbc0c50e9a2d538b23ff9b610776235baa556cd26ea992c349a6d99a76627
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or compromised content management systems. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=breath+of+the+wild+champions+ballad PDF link annotation
    • http://www.farmaciabergua.com/userfiles/files/visibebire.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/56295477003.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/misasikitugidamagexoniti.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c31ca3cdfd13067d8042e51fc00a0a63/wojixebixi.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/detabefusegib.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/6335014430.pdfIn PDF document text
    • https://basisnomor.com/contents/files/wibofoxawadixol.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/90485875014.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/74291889107.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/92435426677.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161390336a8bdf---46174652008.pdfIn PDF document text
    • https://elemonbg.com/Files/File/19426374365.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/fenajevemowinaxanulemika.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/25170995281.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435f998f73e---20422855954.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/nixedajamoritemew.pdfIn PDF document text
    • https://vestol.bg/files/file/31780825504.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c5822fbe---42319867245.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/10726928308.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614547bc2177c---25657625513.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_off0000c4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 16732 bytes
SHA-256: 88ce140dd0d0d043edf2eb79cab94ffe05fffdaebabfe05f1b34d8742522aef2
font_02_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 11164 bytes
SHA-256: 6668ee12bbd648d946c067ee74387d2ce24bb285421141ef9973a112466417c5