Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaef52099d6ba9ac…

MALICIOUS

PDF

103.4 KB Created: 2021-07-22 08:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ffe7d3380cdeb62acabcbc22fac7215 SHA-1: 87adfacfa04b390f448bd0f1c845091ea05657f2 SHA-256: eaef52099d6ba9acb55c4ea518f321ac12abed7d2ec9c4a5a617157037db97ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to multiple distinct hosts, many of which are identified as compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious websites. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://trungtamgiasuhcmmq.com/uplaod/quangtri/files/70929367604.pdf In PDF document text
    • http://hmconcretemixingplant.ru/d/files/waraja.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/85819126338.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/rilovumizomazoj.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/544544b19619970ac317bcce4d194f43/literokidotovowak.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/39592704288.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/wifumaxurevomonejapa.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58b529233d---61039829551.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/votepixazekufedikijos.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/a70695ca2334016bb2d272bc54b7718b/lobamogapegokesonelode.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160aea5931da78---nofubop.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27b78b3d7f---79018437689.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/82359789770.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c452209b320---10234181590.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f53362a0a2eb1ed40ff27a900f95545d/pariwikefurukowusi.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/vikulijifefiripirajetig.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/98702885237.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9de91e5cc---zafamudotilazil.pdfIn PDF document text
    • https://ivanamihic.com//files/41239236733.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6030556517---9049059469.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7fd4ab86799d8aca8076549db9f28313/jazujijisakejitijosofotep.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16221054372706.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e38799a22671705a611deb9cd8c479ed/63197553018.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4919c514---javadamaxepaxebuvi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f602742719c61bc28eb0c617f509c745/56681758226.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/buzakonabavidomazuziguv.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee357e91dd7---29026837716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=supervision+in+managementPDF 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_off00012f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 10792 bytes
SHA-256: c7b702581fd947a385f8448c43584b5bf0681dbebcc87a6b9d455296ddbcb17c
font_01_sfnt_off0001482a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1482A 17648 bytes
SHA-256: 1e8a044be5d599a55071e81420c741d08e3426501c24998fb6ca134c9bcfe3e5
font_02_sfnt_off00017681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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