Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d797078fe837b6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 09:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8cd7c74d575f0f64e041cb749978bc0 SHA-1: 356824be2f5154fb9ad7326a90059eb2d0f48890 SHA-256: 93d797078fe837b6314004262a2c5c60103ada8820295c19165a0c97c35ed458
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145dc8f163ad---vifeti.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/30739879875.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/salabiginiji.pdf
    • http://hmed.vn/upload/files/barugofizi.pdf
    • http://eg-connect.com/uploads/editorfiles/file///funupelexamedidofobonozu.pdf
    • http://aexpress.lv/index/images/up/file/16700272176.pdf
    • https://beautydiction.com/ckfinder/userfiles/files/626209132.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/zaxelilopeburefaga.pdf
    • http://suliaok.com/v15/Upload/file/2021920052117895.pdf
    • http://cupta.org/userfiles/files/20210911174802.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/veniz.pdf
    • http://ruishikaishi.com/upload/content/files/2021/09/20210909102035.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/6200196c845befc0531ca94fbe073ed6/87496323720.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161326a55824dd---48658620266.pdf
    • http://kfbma.org/files/fck/file/43833698254.pdf
    • http://geosond.pl/userfiles/file/nujivifuri.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae54b0744a---jiwikufibopobowupi.pdf
    • https://vargyasnekonyveles.hu/kepek/other/file/77440047086.pdf
    • http://losangeles.songhakbbq.com/uploads/files/80174149148.pdf
    • http://jcon-aps.dk/userfiles/file/godalirakopake.pdf
    • https://diedacorporation.net/freesiafiles/file/99999064504.pdf
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/tojujuvasepal.pdf
    • https://avukatwebsitesi.kocgrafik.net/upload/files/puxevumusixiwapitajefi.pdf
    • http://gro-felix.si/uploads/91121506651.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=introduction+to+evolutionary+algorithms
    • 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_off0000b460.bin
0738bfcba39e5647a26fd810b113eeb41fc55a2a7efcf911104410b65d9cab06
pdf-font-stream PDF embedded font (sfnt) at offset 0xB460 16124 bytes
font_01_sfnt_off0000dd63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 16792 bytes
font_02_sfnt_off0000f57a.bin
4dfd6c382b8473f01a08716247bbf763328ee775b30c49e092a3431266d07bc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 11048 bytes