Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27a7ec441fc759d…

MALICIOUS

PDF

88.9 KB Created: 2021-09-03 13:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bcb99d7f9a29c0bb984487787b7a816 SHA-1: f890af33ee7df8835ce4cbdc5c539f00029d140b SHA-256: f27a7ec441fc759d434a3630568608d23d1ec8c4de0a5ef2bf4db97299d94302
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, and one specifically uses a 'utm_term' parameter suggesting a phishing lure related to PDF to Word conversion. The presence of these links indicates the document is designed to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=c%C3%A1ch+chuy%E1%BB%83n+%C4%91%E1%BB%95i+pdf+sang+word+kh%C3%B4ng+b%E1%BB%8B+l%E1%BB%97i+font PDF link annotation
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609e525d5dd4c---56376545098.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161193388c454d---vofezabixigunowomaju.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/patufabaxusozatoxomafow.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/55256534411.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/13270719490.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/85176810324.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/lupimegi.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85de93e48c---polone.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/92914008146.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/cdf76eb5157fcd41b1a34571c4a89086/legusowakik.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/gajarelaten.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/nomikupatifixagalowuku.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f3fd452c1---bivewuf.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dada4452b---fatodabavusik.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/85c5f2212e4d273f30129a4a4de04992/woburenunefoxixovusuvif.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/20747722023.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/45909307351.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/vimuma.pdfIn PDF document text
    • http://toonesk.com/upload/zodedisuwuluw.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/964d92b3baf35909da1df3e160588ad6/50763311182.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fef46bd467d423cf5d949b098a44c8aa/sotiwolakodefexogedoj.pdfIn PDF document text
    • http://indexone.ru/upload/file/dugomemewoji.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/5db0476f5a043e67974126812e6cac81/bujekivabenikikuvem.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/88332080681.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/13780289726.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/bepobedofaf.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5dbe5cc40---napax.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lesuv.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_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF962 12664 bytes
SHA-256: 910a9fe69a416ed7e9883185965b0c244da6c587afadd9c1a4ef099b0c02d422
font_02_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 30876 bytes
SHA-256: 1d4133f2b1ba37b5be2a04e5cd5fab8362ff6f0bd7ba52a8c8c0edd7722e65fc

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