Malicious PDF — malware analysis report

Static analysis result for SHA-256 289f41e75cf3c080…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 02:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5334ef0fcd93a0c6d016af46559bc074 SHA-1: 1c6a88718a220901409142a6c9b5b5d8a6220cca SHA-256: 289f41e75cf3c080f14c97f6a07262eefc3dd8b594a1ff2e7f5cd5c7c809b44f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwebjor.ru/uplcv?utm_term=ishredder+government+apk PDF link annotation
    • http://accessiblevehicleservices.com/userfiles/file/zates.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/7895109262.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/bikagezedar.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2d8bdf298ed3620ccc105056b3fb74a2/1058613995.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131059c2b4d8---53002399856.pdfIn PDF document text
    • https://successalpha.team/upload/files/5999981600.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2ava3r9r4n4meiia6hgcifbe12/12231535258.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/nelawume.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/nabup.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/66846654294.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/176292975.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/nizimisiwuxudosobaxepe.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/89511676575.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/13016649132.pdfIn PDF document text
    • http://belv.ru/userfiles/file/jedomedajata.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d7220fcde---baloxejuxavagum.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/50869363853.pdfIn PDF document text
    • http://jump360.co/upload/files/20210908083705.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/23120950021.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/mabejulu.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/75458919072.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/62885416498.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_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 17812 bytes
SHA-256: f54cae955569b46a7933b2f7d442c5832b459095e319b5ce0db81dd65a071444
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 10808 bytes
SHA-256: d4bfa11d350dc488533bc57ba26e770f5b121cd3901a8640ab2317d9a6859dd8