Malicious PDF — malware analysis report

Static analysis result for SHA-256 5099153bc5270289…

MALICIOUS

PDF

86.5 KB Created: 2021-08-12 05:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 072e2d0e19e61c9407390a94e6b9547b SHA-1: 786903d08f118d152cd5a179707fbf258479fdbb SHA-256: 5099153bc5270289a63eea94addf1c7b03394eb8c6b9468d20025c55dd306d7e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised WordPress installations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of multiple compromised URLs and the PDF_RANDOM_URL_LINK heuristic point to a pattern of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5eb0165fb5752c0a43de301a1fc1d583/43920362168.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/1668strc1rrcc2ko8pjmeaqrn0/10761593358.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/634b2089c16b676f500be0c0058557b1/vapodogudigozebafol.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6da2b3a7b0bd0e2163baa316f22a67fd/70797653401.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/el4nl6kv92nvh6g7rq77hc90mi/mugaxikusulovil.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3a0ce27cf0087d7784c13382020fcca/daginunudujoxisiwixoge.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/13229642955.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/14238836799.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c5365bac0f086f13afeaf71b901cb9bf/63888826193.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/sviautknk0b52jdvv5d2hblesa/76114332207.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/or7hg3c23tb7rhbsvb5l0opq25/67303191226.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/50962686051.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/hrhr997kdk99f4k6objsiv0g2t/21175478793.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/7ce79643bcdb34700d9341ad99892ca4/48107103734.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ebfeb3cf---81082657539.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/lipibokatatewurezulef.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105170049556512.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/76934984792.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/fuvufirud.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/8784779278.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/30391793293.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/86521956507.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/42536709601.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/t23arbmmp4sj0nf2gg7h88pgci/44424048530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=2nd+grade+multiplication+as+repeated+addition+worksheetPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/aac8ea16b7f0478459c2621c330d2143/96949824065.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_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 11260 bytes
SHA-256: 742a8e830a1e20152fe32aa02ba3ec294ed8c820e7eb5a9fd97d76e4a3138748
font_01_sfnt_off000105ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E11 16692 bytes
SHA-256: 0f3621854db6211e77a54e750fed15cb856e5c154b4f8f22f39ccfc5b0488de3

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