Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e485bdc5e8d8d9…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 16:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d8b9152a90bbbebf9a0c9103c389c68 SHA-1: dad971b21a81348c9141dd936212584ac5415831 SHA-256: f7e485bdc5e8d8d9db8a43881c12b71aaf04d27308dc11ddd11a8d7ba89abd49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://medvor.ru/uplcv?utm_term=controlador+midi+android+usb PDF link annotation
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60478d0e3---korarobarikaz.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/vabanel.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/79238377501.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/74107919590.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/wosimi.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/nenobaraxanowakotew.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136187e8b031---97516026300.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f4c070df---kajerujabusirinovomogu.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/suwepuv.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/fodunifozifebivuwojuvela.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/5083449861.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/92829272455.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/99389778358.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/21878416182.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/fotilowubaravefekokawa.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/ximugulixurumitolivinusi.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/kesimaku.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/vimebiredaxojom.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/keberitud.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/23025806479.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/vewuva.pdfIn PDF document text
    • http://vuason.vn/upload/files/rekulikipojawodifezebozo.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/sopesasujepi.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_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 10548 bytes
SHA-256: b6e6ef2a641750722cc9d0f540ba4baa0ac58ca1248439a3f6dbd6875e9bd4e8
font_01_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 16448 bytes
SHA-256: ec4bad9a4e9a341a3c571b16be527fb6ead58e23c6e731cf8178e2b62a018bb7
font_02_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1