Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43366790e50dfad…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 09:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9efa6aab15b91a8c99b948f3111b515 SHA-1: eb864a3b12c8d14fc75f72d77819b28af976cc74 SHA-256: e43366790e50dfad496dee070607a81582b6f9487730044642cb38ec2fd543d3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=how+many+frames+per+second+can+your+eyes+see PDF link annotation
    • http://sieuthimaynhapkhau.com/upload/files/gemejakagatosiliduwes.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/pafilurodizudirog.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/tutavux.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/53649729659.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/61303542810.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/legazuzazemereku.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/66716027333.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zapotadalavepepinizesem.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/96652027151.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/je9tbdgo4e6qdf2hlu9akj4qgo/52897166356.pdfIn PDF document text
    • http://electric-kernbichler.at/33138273568.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3e248aa287fd4f74ca8e51b0accc7493/91992932042.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/65340150417.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161391ba0562a1---vogowu.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/56116964112.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/wiliwa.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/975425449.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/dodaboketuzotuz.pdfIn PDF document text
    • http://slsnn.ru/content/files/49447568798.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/79025027373.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/2910bb4259477252fe87618b3ca4a8ee/kixetejoxezamivitofemuvet.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_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 17948 bytes
SHA-256: de6a498be1377d3205f316d72b0d5453d8cfead553e5a6dcc9456b76af530a86
font_01_sfnt_off00010535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 10836 bytes
SHA-256: e87209996de459511d1b7bc598daf7c97d0792f1a499b45ed9133e8436d017ae
font_02_sfnt_off00011e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1