Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b8eff8dcc1cc09…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 19:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ea6ad120986871e97363be2e01c3cc4 SHA-1: 1b0c7b554b90153227e53e1318fa4994a9834dea SHA-256: c6b8eff8dcc1cc093faa7f32d309a69f8d7b2450c920b0c845bafa88d49da8bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/eeaff4d15ef43cef0cadf21fc53b5f37/95476559542.pdf In PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wugejot.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/6e4ab7bc10bf6e10bf3dab61839a8964/53354066743.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/pudijidopabinoxib.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160757f28ba2cc---pojovopov.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210808_3D631D0B6F073718.pdfIn PDF document text
    • https://saam.vn/images/content/file/bewok.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794412242af---fuwitejanizoromilisepi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b2ccb0e9---toketerora.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8b6svg6p4v388s9jrp2iihshc8/62268440045.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e044d60c73b---lasaliro.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa20ae7bfa---kozobivi.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/21315837595.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/28c99676b6d43b1acad39228dbeb3e04/66476961315.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c990d7e9b8c---zemato.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608682199fc8b---karalaledabukoxonexanikaz.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccfa72c00c---fotukifetapadopugamonibok.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/xokikarefepexudi.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/54388473818.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/zopobobelebesubawasez.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/54927699401.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/76921994781.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a914740a90d---dawefiw.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/85859942793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=glibenclamida+pdf+2017PDF 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_off0000cc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0C 10820 bytes
SHA-256: b31514224cb1c778ad5837d1b1d1833f4c4af9b9c310675117761afc7ba75edb
font_01_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 17824 bytes
SHA-256: 06e71974cc7e4698305c76c1fe99192f30c2a1741a450271b6c25a297e157993
font_02_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1