Malicious PDF — malware analysis report

Static analysis result for SHA-256 611bb4559c59f662…

MALICIOUS

PDF

111.7 KB Created: 2021-08-23 15:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00227baadc6bef011db149b76c7f9390 SHA-1: 8d73ded297347188ce78d475576a408a7e2b28b4 SHA-256: 611bb4559c59f6628e51eb0003b811160a08ee62c456ec6b47db1d40baea0e2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites and disposable hosting, likely to distribute further malicious content or phish for credentials. The presence of external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8122

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=tamilrockers+tamil+movie+collection
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/201ae438b88a516bc551b2839bfb16bb/javufafowafefexudapamob.pdf
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/sodokabomewejotututaporo.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/o50te7qvbc7lkliqbglhshr8sa/3711823124.pdf
    • http://galgalesh.com/userfiles/file/69488825727.pdf
    • http://dieta-plus.pl/userfiles/file/zevadupekonotivalimuva.pdf
    • http://firewheels.pe/userfiles/file/37107700401.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4c524e46---laluxexidiv.pdf
    • http://universalestetic.com/userfiles/file/488307966.pdf
    • https://mimpi1pusat.com/contents//files/80409465654.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16088e67250273---karinawufiroritenume.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/mavemitava.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/2694037725.pdf
    • https://hutechsolar.com/upload/user_upload/files/25005517030.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/23193577356.pdf
    • http://enotecagaribaldi.it/userfiles/files/92030354176.pdf
    • https://stcc-sa.com/motakamel/Ups/files/85193734920.pdf
    • http://bioident.pl/photos_fck/file/39605797419.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb9c8d62e---88179467691.pdf
    • http://servmed.net/userfiles/file/loteri.pdf
    • http://morard-mcf.fr/data/Files/romiwosobeg.pdf
    • https://holocaustresearch.pl/nowy/photo/file/bewosana.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cg1kbj3moaks1q8r55o2k1dhf3/puzejezanapazisilawilel.pdf
    • https://signika.pl/Upload/file/65187691480.pdf
    • https://hospvetcentral.pt/site/upload/file/848026373.pdf
    • https://debcopharma.com/userfiles/file/kadutajolig.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017bf2.bin
2ef015dd6d039ee51a718cac3cbbaffb6f5f875d8a0103f3c9ecbf61e9dd8a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF2 18388 bytes

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