Malicious PDF — malware analysis report

Static analysis result for SHA-256 79577d4bc4c280f3…

MALICIOUS

PDF

83.0 KB Created: 2021-07-30 16:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2394e80692f8def021d022571da602ff SHA-1: c98cf68b82a200c9723a064f2272c8ae83061dc0 SHA-256: 79577d4bc4c280f359b25d8ec237f8c0f93f83ddf6c271ce5b584282359c5368
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to distribute malicious content. ClamAV detection and ML classification strongly suggest this PDF is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/4nvq67ig3jk0ourqcbn743d7m1/94232438682.pdf In PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/vobataxenusetubeve.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e527e10d1de---47613400925.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/75843317670.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/nuco7d17h71d0748olbat1sh1c/wakubilisibamewemiluxudu.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/71167187971.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/lalarejadizawufikamo.pdfIn PDF document text
    • http://ktcz.eu/files/files/jutigujufepufugix.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/pisajogadufonudemi.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/17503305171.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/vivosovuxopepawe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160741ba6b60f9---wewox.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-21/20210621212949491131.pdfIn PDF document text
    • http://4bx.pl/public/file/3792689603.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vqkk6bl6htr9mc62vfuvfohmjh/sigogesuziw.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/58e82ae7bfd2e4a2e2610d7e9b012154/4655070031.pdfIn PDF document text
    • https://svltv.in/userfiles/files/bugelafivovijigojeg.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d20c489fe---watole.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/33397797886.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/e393022ccfc6sfbi0rc4dngcgi/6514451195.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/6394269791.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/73448827089.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/87618050975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=vamos+a+cazar+un+oso+pdf+descargar+gratisPDF 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://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_off0000dcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB4 18676 bytes
SHA-256: 1e2cc47df9a1c602a84bb8843e55fcc95216cd63569832a6fb9d94bfd54f3efe
font_01_sfnt_off00010ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE3 11044 bytes
SHA-256: 721979006e830257a6e89b2bbbd3024efeca363a85774233bbc25139206aed79
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1