Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8ba9e4c699b5a9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 17:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 396050fbc9f9118b50f70b4b457bf8c6 SHA-1: d7c290b5e620bffb0851de018b76700063b4dc0a SHA-256: 8b8ba9e4c699b5a9e188d9508a7a64a8500885e2ff8c0bd0586d80271b2ab4ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to numerous disposable hosting sites and compromised WordPress uploads, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious URLs, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=android+hile+program%C4%B1+rootsuz PDF link annotation
    • http://busankid.com/webfiles/board/file///tapibilamaragaza.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fefewobubuzi.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/lutavaxasezaxomaweta.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/gobegaxezowepuwidesetaw.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5a3b265b60873f2f3fc7e6aaf14f056d/labususumubemafodinufikaz.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/sigiwe.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/bakadetikalumigir.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/50068403768.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/67396192845.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/golifapivor.pdfIn PDF document text
    • https://equimat-cheval.fr/file/4065910712.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376eb7ae426---91273794313.pdfIn PDF document text
    • http://bibikid.ru/upload/4208197045.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/85668596881.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/412622799.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/8748880780.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/dejujigubaxo.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/57341910258.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/rawemirenalibekalepa.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/ligijaru.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/21096489529.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/kapojewelazejadidego.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613d88bbf3999---tejevupe.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/bafowewikis.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa4de151b7---58314417356.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/maxikadupepokogadelewu.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_off0000d3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C5 19388 bytes
SHA-256: 6b0789df806d30a8d07f113b23a94744316aeb867e4ed0e4215be78148389903
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 11028 bytes
SHA-256: b77017f99a9ca8d868f87195d623b968c93f3c78dec8c5810622d34be26fc77a

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