Malicious PDF — malware analysis report

Static analysis result for SHA-256 9674218cb38ae276…

MALICIOUS

PDF

82.8 KB Created: 2021-07-17 02:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16d78e618fb1069e043c2555e1976c68 SHA-1: e4bea9ebecaaf3f70bbf51f4a302fb13b96a032f SHA-256: 9674218cb38ae276d8cdb2c7d835c98df9687c50c58bf3096cd1bd9ac7c9f83a
104 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains numerous links, many of which point to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://picinterior.com/ckfinder/userfiles/files/84614916327.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/97855657038.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0205160cec---fedomex.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b5079f728---92595112074.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jc3u2nmgbb5o1kf5p3krb4chlk/zexowodagizutosivedevari.pdf
    • http://softwarefactory.nl/images/file/fomukuramobi.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/53657795224.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7sdotmv0ila3pf18qjvdjf15j2/83978746712.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ca9cdbffb29625503b0f0ca54455ae02/zepux.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3201801877ff21d927ee212fa04729ed/jakupoloditivekenuzos.pdf
    • http://msinziniering.com/userfiles/file/75023892464.pdf
    • https://wagaskar.com/media/xusopepikosoxa.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/61bd1c4178ccc379c2b9808666d4000e/95351196392.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/u9f8ff4564af9k0vq8nnkn1kbg/winikedenujepas.pdf
    • http://bestbuyfromindia.com/userfiles/file/namasidevum.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2484dd82e4---katezaradexupakajiratix.pdf
    • http://uppercanadatwocylinderclub.com/clients/877835/File/38030508297.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/89df627792b6dfd7fc121c577bdace25/74893083637.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/scqa2ht4cqs371fp7hn1slu6r1/1330167201.pdf
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/318991909.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c052f0bed39---gapoda.pdf
    • https://callalilyvn.com/upload/files/58304887983.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/dt15hbcn8cav5bfj1vjpnratq789lh1d/zitijinobesivuwiman.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=odt+to+word
    • 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_off0000e479.bin
d02c8046ba7388fd388cf5a14aae63e5d72be63a8a4023222f5126b8d22d0ad7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 9648 bytes
font_01_sfnt_off0000f986.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 16792 bytes
font_02_sfnt_off00011198.bin
072c4201e93b1d5fdf880e9ba28ec0225a955ec527cb8b7a4a02376b29cf38c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11198 17220 bytes