Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ea54c727ed7776…

MALICIOUS

PDF

98.5 KB Created: 2021-06-22 20:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83d874b93944da71ad4f9fc5d93d5646 SHA-1: 67a7384cf1d68222ba38f483f54fb7b732972332 SHA-256: 54ea54c727ed77767da8deae5ba8221b192a4af36c61ef8070beb8fcc3f88bf7
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9530

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://batikatravels.com/userfiles/file/46689316966.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2a736ff8e---55566496406.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6bbdb8b77c8f134dcdce1c0512def6fd/13447572038.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a161c89d---4032277637.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4b37a22f77bb5bd5d4fe61a67071afd2/5380242413.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ajj1f8su65jnl16rmhubj3hngb/5499866458.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/25703cd500315517f1bf503702dbc711/96439508721.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608502f93867a---66842703320.pdf
    • http://www.radanhorse.com/resource/files/15075010472.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d7efa3280e19334711d80880c7de43b2/98420277852.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55f71e57b---84747530003.pdf
    • http://derma-dts.de/files/file/12955050389.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8aedb6ebe---52313677406.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458c082848---vipeperakikumikabuziwe.pdf
    • http://splogservice.ru/content/file/14940381570.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095640327bc5---fefusonozevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=core+java+questions+with+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151ed.bin
83549edfb830ab59dddbbff3da6a2c3b342bae984db06cd28fe13f14fe0d8209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151ED 5000 bytes
font_01_sfnt_off00016305.bin
d0282a9ac402d456393f85422d58e829acf84d4bed247eaba46f2db767dab3bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16305 11832 bytes

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