Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6b760e351c2862…

MALICIOUS

PDF

94.0 KB Created: 2021-09-14 06:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fd18a1f3ded98dcee883ee7d1feb67df SHA-1: d6be17e9a93e3ed86807d0bf388f5aa64cded219 SHA-256: 8b6b760e351c2862f7d2e2ad7d8aa5275103a5d5bece170488222c05462a4563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of multiple external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://avvocatogiuliani.it/userfiles/files/20742733212.pdf In PDF document text
    • http://wiskind.com/filespath/files/20210913213302.pdfIn PDF document text
    • http://sushibelovo.ru/files/juzevoxidanupenut.pdfIn PDF document text
    • http://kodemari.info/data/files/betix.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ea113bb5---28810467051.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/61581356445.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/suwisemovuriku.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/67004350200.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/74300449858.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/nevup.pdfIn PDF document text
    • https://orrizon.ru/images/file/5726174742.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109122351046687.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/14278467600.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/wawono.pdfIn PDF document text
    • http://tiquital.com/documentos/file/notefilelakozug.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/672657299.pdfIn PDF document text
    • http://josquin-capella.de/download/33185440957.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/16838478820.pdfIn PDF document text
    • http://trieuduong.com/images/Download/89662412760.pdfIn PDF document text
    • http://boldogelet.hu/media/17198119426.pdfIn PDF document text
    • https://architektor.ru/uploads/file/15477466921.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/mgio4gfri83u23hjia45l0agv1/48234048237.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/jufenafawofobitevotem.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1vvo4r3a923r4n0mqdeb92jt56/luburoxizavilifuzelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=automatic+millionaire+workbook+pdfPDF 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_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 11012 bytes
SHA-256: 3d12ed38ece619d550d72350a801b50ed2d01780d9a0d12743c055f8f557bbed
font_02_sfnt_off000136bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 19872 bytes
SHA-256: 80445e6e0b92d37bbba3212d5a82ae57ee03a343ca57e166cb10560c9e192e2d