Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ba7c188c9d78aa…

MALICIOUS

PDF

79.3 KB Created: 2021-08-15 15:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ec6bdb9aabf88a32f5f17055f931473 SHA-1: 3988d9981d86c3c93dd35d99ea81c06347172848 SHA-256: e0ba7c188c9d78aaa67aeaca68eaec025eb3ad70dabcaf4b374f9ba73fe575ea
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fde173bd1d0---kudesuwusotiripakaz.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/vukavomok.pdf
    • http://x04ydivan.ru/userfiles/file/89683885191.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4152de6622d2b12e01dd90b77b9ee343/puxijovisovagiguzotitir.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b1b39b88d32c4d69ed211fe184f5acb5/rawokigamep.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8b2cf519f3336d132d5b05c20e30910a/mezidobafesinezofapa.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/pijebekoxokeposatuvim.pdf
    • http://gesht.ru/admin/ckfinder/userfiles/files/16319939404.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fd12853082688a7cc938d230132fd5bc/71062610050.pdf
    • https://harkakotony.hu/UserFiles/file/39740731892.pdf
    • http://szao-spb.ru/images/news/file/88320464073.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/70734854795.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b2a7c13bfe93a2784f9fe4fb4d4f24a3/magadavu.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/mfog9f2r8gh01ucecid2ih9q82/41649143969.pdf
    • https://drlanda.hu/user/file/vurevefekiwogogaxew.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/52srf69ngq16eum68k9b3h089v/zerigugaba.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a3526eef---bezofuxujowozutuko.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/18906648827.pdf
    • http://marcth.pl/media/fck/file/9393363463.pdf
    • http://dainichiji.com/upload_ckr/files/zawebazuzujijezi.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/77dc67e90964d3d4ae1905ac6a07e30c/vataxugagi.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609479c262eef---rulizo.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/nk486v8h9emmlql8j67fcb5406/79496751784.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+great+gatsby+chapter+3+and+4+worksheet+answers
    • 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_off0000d2be.bin
78170783d6ac0bf2a6dfeee227bae2c803804fcd72f80bf8732f7b83ef195a4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 16052 bytes
font_01_sfnt_off0000fc0a.bin
e4494d1a533a08ec4d031ad49ace49c4fc47a07c59007e99ef268ef063fe2299
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 11300 bytes
font_02_sfnt_off00011654.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11654 16792 bytes