Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d6cf67c653675f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-22 21:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f58a16f8dc943924d068dfbc2be52c33 SHA-1: b682b01eadefba6fbc27b0d77b13052318be3c23 SHA-256: d3d6cf67c653675f216ed5deeb30de0a76a5cfb92a2bb48b8109a51c449bf179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=64+games+apk PDF link annotation
    • https://akamercedes.com/images/uploads/files/wupugifovure.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/jexuroxivusebawimidete.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/xexiposepekiwilubag.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/23725591319.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/2cd76e8044ed40a5684bb374249d6c40/fowat.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/91354511765.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/97323477492.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1986362be---pusib.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/46805921942.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/rifajekesuramupefaro.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/38139334741.pdfIn PDF document text
    • https://majubesar.net/contents/files/palabamubemexigowevipo.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/97197610920.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/pikimirixoxe.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/jexesezunupudesezesa.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/pamelevadisojevapobukukag.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/41165667903.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/kavejolupinofoloduvazagog.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/94730718698.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/57skncgij1v2h0sunmset7t894/67819481535.pdfIn PDF document text
    • http://centromp.it/userfiles/files/57180161636.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/fikosomogujepanepefofo.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/3696869502.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/39214347445.pdfIn PDF document text
    • http://yepuco.com/uploads/files/1463637340.pdfIn PDF document text
    • http://standdominica.org/files/files/pijofurudetuduveniv.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_off0000bc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC42 18020 bytes
SHA-256: 7db2b069c065f81ed17c3853019803ed88f59ffdb191143b24bf2815b7ff233e
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 10276 bytes
SHA-256: bd4576812e8470605e5fa7242f089daaaadc83cb6345bd6913a152c032d4674a
font_02_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1