Malicious PDF — malware analysis report

Static analysis result for SHA-256 380cdfe2f893ecc6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 22:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 885d65b54f4761282e181aa0d087c2e9 SHA-1: 5a7b2fdc6301aca6981b7b0c464c9992ae582e32 SHA-256: 380cdfe2f893ecc67fa94613a9d722a16956ccdf8fa6423f0bc321c574843fa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://m-isc.com/userfiles/file/kejedukiki.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/hitnuu4dbbna807ij1ub3easa3/mavoladipapatisex.pdf
    • https://cyberbirddog.com/userfiles/files/foronasofi.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f38bbd4fdef---dipopoxufi.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/92daa47f268e9012acdf48a7435619f1/31957839646.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/fozumusagulegozexisi.pdf
    • http://esoftland.com/userfiles/file/bogaxiviraxuvir.pdf
    • http://goldstecq.com/userfiles/file/goxane.pdf
    • http://leguido.net/files/86283724013.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/vosirulas.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e0a829a62---8114077023.pdf
    • http://4bzsoftware.com/Images_upload/files/weziso.pdf
    • http://technestudio.eu/userfiles/files/3384981850.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/saremo.pdf
    • https://bem-sa.com/img/file/mumujigenap.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ec78926b5---65797891213.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126615b36c93---63464107736.pdf
    • http://dj-maily.com/uploads/pages/files/55403177700.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5c714d619c3faf277cf3cfd34eeb7495/zuxori.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c1edcd43e---mobal.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/oebob03if6a6uaq0uii4ed5vsf/29800988858.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e1cda45e4---20861781818.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160849a36bdea4---50262967821.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee3527937---57972298266.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sda+stewardship+books+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_off0000d0cd.bin
af2b4ec8482f9f19983531540423db139368e253a676cc228fd4de941666680a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CD 18896 bytes
font_01_sfnt_off00010238.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16792 bytes
font_02_sfnt_off00011a4f.bin
b5a3676ad88e27963a9168d7a7b2124cfafc7073803678500c5e07de9503d938
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 10836 bytes