Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5945e8c4962244…

MALICIOUS

PDF

87.6 KB Created: 2021-08-02 17:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc938e8765846c9cf4b57d24df53cd10 SHA-1: 5641e3601949fdaca2c75fa1f559e6de7211b6bf SHA-256: bb5945e8c496224423423340878e72e4f3c5ba5e74fccebec3ddeb37cfbadcfe
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

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 https://crewmak.ru/uplcv?utm_term=ejemplos+de+ejercicios+de+punto+de+equilibrio+en+excel PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ea0f00d85---godarupofe.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b8a17046---roxinaler.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1759568e84f3e86fa5b7bf575189e26e/zizosumedunol.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/86f39aeb7a7fcbf29df5420acf5dbb5a/zisupowisaguz.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/pixexarepuxixifatuli.pdfIn PDF document text
    • https://wagaskar.com/media/44518352331.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be2b262e5e1---33585161540.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/33752128663.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747bcd7ec66---femuwi.pdfIn PDF document text
    • http://samtekelektrik.com/files/josisedotegalerofawexeji.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d2befa9f---67359097098.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/laxuwira.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/bfd32a06a68e316b7b5bd2a8ef7c8e23/13585548430.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/mefemavuxopixibifibopatil.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ee49a03a6---28093601658.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/matupa.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/1987835287.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/sidasegikujidusekaput.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e09c5bbd8---70665797934.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/joreleruwikezoxurunud.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8b500e584---meforiwedubin.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/45162107502.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/sarerufopejuzeliraf.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/92161980020.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_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 19644 bytes
SHA-256: 02e97a1fe4056869df22cb6809c2a3f080b0d8aa486b8423418e6f3593417210
font_01_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 11116 bytes
SHA-256: 8b924b691bdf31cbfbefef0fee06315005a31efabed0ec5c1e190b47fe2e6d2d
font_02_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1