Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e22b1172b1bca5…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 06:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ff398c260aa28cbeb20a0f16f9c3153 SHA-1: 1dd903200bb6cb96a7a120573a0f257ab0e0bd89 SHA-256: b4e22b1172b1bca5b464c1754df732238c248bd4b6f10cf728cfc073283f4f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised hosting, suggesting a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=map+of+consciousness+pdf PDF link annotation
    • http://cableesmaltado.com/d/files/zazumobiwajexutamovijo.pdfIn PDF document text
    • http://tcihk.com/userfiles/8029571528.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///95963117224.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/98c60a21109ba1351d13db3c6b1a9451/vanix.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/pipupazig.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210901212135.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/dabovirafaletatevu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386126a83c4---poludomegokapeju.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/lubiwebotesigusuzidobaje.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/64818153898.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133317312d18---91889215165.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/givukovozizeleviveko.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/buremofuxepokinemakireji.pdfIn PDF document text
    • http://maulich.vn/attachment/files/pogem.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ot8fpbh66iegsp1k5sh74t0e3m/bepurupo.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/nedozu.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/kirugajujana.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/73560548681.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210906150900_fe032f.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/13626254941.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/latut.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/kawosifuwo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352f2495408---61060133906.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/maranegi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138579a30311---13371911799.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_off0000d65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 16712 bytes
SHA-256: fa9ca1ededc7459d021302722598b23a523ff6ca3db618f0cd421da902282b7f
font_02_sfnt_off000119c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 10464 bytes
SHA-256: 1f8b14f68cfa880ed3b95485ae39859684d0dec2d988d980f7b83a39741d29d7