Malicious PDF — malware analysis report

Static analysis result for SHA-256 391373fd3a236b76…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 13:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c0b9145810dc68a36ff25edea124d29 SHA-1: 6ffa4c6aee24edb19da2ffa0c34fe1ec3b663578 SHA-256: 391373fd3a236b76ae5c5a81cc23670cfbb42a978fb62bc7f0ed0d00aacd2e69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ladangmimpi.com/contents/files/dijegiluri.pdf
    • https://greengenome.in/admin/userfiles/file/43483953979.pdf
    • https://santehsevast.ru/userfiles/files/xumetoxuwijumaxu.pdf
    • https://firsatoyun.com/calisma2/files/uploads/sufovibizuvabuwobokewonid.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614299c913731---9676335194.pdf
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/vometirusewowebujulokimu.pdf
    • http://www.uc-kushiro.net/images/library/File/26351862122.pdf
    • http://bafiti.com/sklep/userfiles/file/xatukinelas.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ab1767f1b69a450d7852d0a145149e4f/98977199210.pdf
    • http://netflor.pl/upload/File/14140876514.pdf
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/61253281005.pdf
    • http://bxbrdh.marketsearching.com/upload/files/781876726.pdf
    • https://newline-eg.com/userfiles/file/gabalaguvepevod.pdf
    • http://cnex.cc/images/blog/file/36721085024.pdf
    • http://volamthienha.top/userfiles/file/tupeduvetizabisixoma.pdf
    • http://uniradioweb.info/userfiles/files/92966545612.pdf
    • http://garage-ys.info/js/upload/files/mutesifebuxuwivime.pdf
    • http://csc021.com/userfiles/file/20210921144528_yprgcd.pdf
    • http://haphadoor.com/upload/files/zoruzeseruretazifadimeno.pdf
    • https://ashleymongolia.mn/uploads/files/segifuwatife.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e859596300e096a33088115e96cb7618/60218984075.pdf
    • http://studiogallerani.it/userfiles/files/26570863579.pdf
    • http://janaturismointegrato.com/uploads/file/29892342145.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/11757178452.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+system+info+app
    • 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_off0000b225.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB225 16792 bytes
font_01_sfnt_off0000ca3c.bin
ae01928687816b2d5b3a12a2c9659e622f3a459721112a5fa51a36b7edc8e99d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 10708 bytes
font_02_sfnt_off0000e2dd.bin
e01fdf28c725ceac633f380461501a99071b68c358dd5fc436e5f49bfc04f6ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 15096 bytes