Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36c63c8a34bfd71…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 13:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d06cad7e978ba719d7b5e9d21e0fbc8 SHA-1: ebbacade117b16bdc1cc5986c83b253bd30a9320 SHA-256: f36c63c8a34bfd71f241e3416262fd93e1db7ba8cd4fb1b6c51b98b4e1f911a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://infrive.ru/uplcv?utm_term=best+fifa+android+game PDF link annotation
    • https://stka.gr/ckfinder/userfiles/files/56653414760.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/dimag.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/82189535211.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/74120441676.pdfIn PDF document text
    • http://unsersohn.ch/images/file/kexemeginimugonoxurid.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e404ab8c16---senajexegedeg.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/paxidijuvexuwomi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613520f9e1b63---dasuz.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ee6t20docekv6co5dg84aj5hd6/jarobosefinogi.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/56666850261.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/15453105090.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/59827989554.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/42594069887.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3f4ebf34---ruzodub.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/95564429.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/vojoxomojalaxu.pdfIn PDF document text
    • http://qdjshg.com/files/file/83116343274.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/17331086245.pdfIn PDF document text
    • http://vititanon.com/user_img/files/wodato.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/11913495453.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/xapogagefus.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_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 16960 bytes
SHA-256: 56f9eb24715f01a1c53f4bbc4dd3160042b09ef5aca626ebbc2090ec53b77dbd
font_01_sfnt_off0001152a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152A 10704 bytes
SHA-256: 3b2cfee7918e8e67e970e74181c2f4c80d0066784ce25a152617b0c7058e9c4d
font_02_sfnt_off00012d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1