Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20da47022e6c4e8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 22:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 576abcdca271ed01cba86568a2d4b44b SHA-1: 641cfdfe36b2cc2925a0bff9087cdb718a0bae8c SHA-256: d20da47022e6c4e863a5c7e1771d828b199c849358e2159ea9f2d93e1eb9fd6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

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 http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/59079677285.pdf In PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/lipobavejofuwunexomideta.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/95215182188.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/20935408011.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/federenokoxefuzananofanom.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d073878530---wujif.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c0177ea8---zebotesoxuxojuk.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/31185500920.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/5746788996.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/60557309152.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d24ddfe0261---18705382544.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/f5e40bc71afd1c11db526641f7f1f567/22762963735.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/buxabomusumiwazakumajav.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/89990211754.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dead06b79d9041507619e76ad637e3dc/fimosuxanisodubed.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/27277875400.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021061116151472.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/jamojasaravet.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/guxoxotuzowu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/90203422821.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/135f3e7b5cefd8c2d3b0de4d0f85cd46/54968116903.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/84468872934.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/26aa3749441c07036f014c0618029fd8/86429285849.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/45362646066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=raport+final+tismaneanu+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0942cf0a518eba61187ffa77ab90c188/lozefefid.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_off0000d0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 10804 bytes
SHA-256: 2a264ab94120ca27da17b2e5b25fdacab90ce3ef157ae3b61977aa59e98255a6
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 18700 bytes
SHA-256: 2c0ad563134aad07bd1c82909ff041c04753a26e000334c210f5e4f0f8141aa0
font_02_sfnt_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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