Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96e4c58f8ced171…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 07:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 88c1a83ad829d1320c488af8ea984a2d SHA-1: eef27446d4426ebe28017b399d3077821634709b SHA-256: e96e4c58f8ced1715f9f64241a55752c80626d1449e33b4b21c62d3dba241c6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of these links indicates an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=1800+in+24+hour+time PDF link annotation
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/77aa6556a8eece65b9432958834c3414/75449708867.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/sefemisimabub.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/wetafuzutewif.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/33873008647.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/78741772608.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/69825008754.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3jeufq2cnb2sjmacrdhqnjp15c/80463816411.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/36069924454.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/modosumukajazikotumobaj.pdfIn PDF document text
    • https://luminex.pl/upload/file/9340071020.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16153a266e23d5---fabiwujotokof.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/90575a231fde2bab76581752d7adf20a/92961391313.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/dokuz.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/fosibagevedanizorekok.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/gudebujazokafasamez.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/bikugonawuzor.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/wuwiwukubevipin.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/v0vbag281g799rb5nd1b7cks20/50457821235.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/pavate.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/85471683665.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/497441702.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/topopalela.pdfIn PDF document text
    • http://ccshecea.org/upload/files/88601448546.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In 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_off0000b038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 10580 bytes
SHA-256: 110aea85428c919f8f6ce35569a84383af0be778c91fa5bd633b3de2ff28e819
font_01_sfnt_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16272 bytes
SHA-256: 3aae6c8a71f40d12d875b93efa3b2bfd8aaf14bd22fcad56a769791b108c64e7

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