Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c598b0b8c83c98…

MALICIOUS

PDF

76.5 KB Created: 2021-09-09 00:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f1b3dba8ca5b9e5868d55ac9c1a2297 SHA-1: df101df0fae9638df7b396c21c1b1d2a01cfed82 SHA-256: b7c598b0b8c83c982eb627945abb06f5f5eec0df21906bf430d081b97ed6f1ad
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/35632649565.pdf In PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kujadodewesuzonugel.pdfIn PDF document text
    • http://riversedgefm.com/files/file/81476585567.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378ec469be3---dugomazugoxapawelivise.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/22771559668.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/13746950402.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/wokegube.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161304f57565b5---lubenanoxo.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/53972386020.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/nitekizogutokurabaxotuf.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/78108252437.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3231d209---muvajaronomi.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/vakilomigafarax.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8056810998a8b698a2edff6ef914a7b2/vebile.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/81879671650.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137832667ebd---32640045751.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/pupetisegimukozas.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/jepojuvijekofa.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wezenok.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/63060126556.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210902/files/20210902182254.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/96779074702.pdfIn PDF document text
    • https://kimcert.com/E/file/21542895561.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/fobirafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=9xmovies+hollywood+dual+audioPDF 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_off0000c551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC551 10748 bytes
SHA-256: 537ea75db6bd5ed78e04f1e2171e485cd3aa4aed478f79a00ef749ba9843a8e5
font_01_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 18068 bytes
SHA-256: 9161d09b05bcebf621b8b2afa431b5f7933fa3de3935692d4026409105063683