Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7224ebbb4468ab8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 05:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9efe6f0c45d486ac81aaa0b0289f9bf6 SHA-1: e35cfc0204a6a8e8fed10187bf8dde1530a4ce74 SHA-256: d7224ebbb4468ab8938fba504ca1f6e99dfbcafa92e04709ba9e5b907b400362
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, including compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://allytemp.ru/uplcv?utm_term=move+app+to+sd+card+apk+download
    • http://prime42.ru/userfiles/files/82197829818.pdf
    • http://studiotecnicomartani.eu/userfiles/files/sosazinujugunot.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/75324f8d13e110d1181ccab91bfb6028/14703046528.pdf
    • https://susta.vn/userfiles/file/50971446200.pdf
    • https://hexema.com/FCKeditor/file/medovu.pdf
    • http://chayka-svg.ru/files/82795663701.pdf
    • http://automozg.by/upload/editor/files/66740084686.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/47977781475.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/59409349751.pdf
    • http://terezmisszio.eu/files/file/vumereporoxiladekadi.pdf
    • https://calienglish.com/ckfinder/images_store/files/17226392635.pdf
    • http://vietnam-intraco.com/webroot/img/files/83284174822.pdf
    • http://www.rajpuc.pl/pics/file/pivimutigazovutepuse.pdf
    • http://arabstina.com/ckfinder/userfiles/files/40597255964.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jt9qk2uciefmhpkj37ki1bm0r4/5812142390.pdf
    • http://hanhthien.net/uploads/file/31537495655.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/bipipedaruluxa.pdf
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/39891204845.pdf
    • http://directartdeal.com/uploaded_files/userfiles/files/44539322909.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece2e18c50---rewupexodegilem.pdf
    • http://dkmmotor.com/files/userfiles/file/logijosoxubemewizo.pdf
    • https://areopag.ru/sites/default/files/uploads/tutulavefe.pdf
    • http://martonelektro.hu/files/file/mubabum.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 16792 bytes
font_01_sfnt_off0000e959.bin
20d286c5b9b2a4a269cfeec361730c8cf5b0d7101e60afb215fc51bf0b9308f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 16944 bytes
font_02_sfnt_off000115e3.bin
4566923ca594307fdff8e3dc03eb27a832b72c029eecc8e808a8b5a2ef523742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E3 10652 bytes

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