Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e8b6088d45b0b9…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 17:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36de60566f722ae14bde568261d399bd SHA-1: dce2ec91a6c426c0ee8676874867823819e70c19 SHA-256: f8e8b6088d45b0b9a987c0c047ac61e8e6137f011d4e0d45199a681221fd7005
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=tell+me+you+love+me+full+movie PDF link annotation
    • http://handgun.ee/media/file/mifotobikiju.pdfIn PDF document text
    • http://usmleworkout.com/files/file/xasefetemonuvug.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/kabagizojefedag.pdfIn PDF document text
    • https://pokereshop.cz/data/file/23288313679.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6eeb44ada3626825d0d7c6c1ea2981bf/37036165113.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/61465145963.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/13713950410.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///getefomarororosi.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/senigitixokid.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/75648052607.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/mazufikinofodujuzibo.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/29338723891.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/xemudirukotabiruselakav.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/befowu.pdfIn PDF document text
    • http://www.grifin.sk/files/vamuzutedem.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/gelelafovegazujalaf.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/25340770240.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/95715750240.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/ropokupovuteb.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/10325883200.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613914592f5ac---41540109533.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613491f566ae2---rifiwowapepogewivirewexa.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_off0000caa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 17732 bytes
SHA-256: 04c6cca7000bb589de654fe70a52d5f7c8af9b10ff1585e235c3cabb73026267
font_01_sfnt_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 9988 bytes
SHA-256: 0c9a38a892a729f5cd54d8bbfa2b2c4afe54fdedd42c30d640014bff6fee2d7c
font_02_sfnt_off00010f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1