Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95e5a9961f21017…

MALICIOUS

PDF

63.8 KB Created: 2021-06-18 00:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9a49555b500db9b857eb267b4255b4f SHA-1: 43550370c7826bda1ecc60dd7b716380a51613dc SHA-256: a95e5a9961f21017dc7b5d7490603bf027c8d34f7103802d26640ddcaef519f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9515

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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d62dffdd---defubiwize.pdf In PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1f5bf6765223f32af5b1eeddec7f59dd/goregexofafoxidagenuzomi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2fd244283b3e7ef39fa8f920fa39a235/vuponolevom.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/18/file/20210518_064346_109.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/11pk0qb1def10ksrnvdu12kik8/22830982284.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4b2b93f2c9647dd6f9f4bc10b0895ca6/23057716647.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/40168842039.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1df77194---39468537005.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210609203240_s8nr8m.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/28194694907.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7bc283b3adfbab34f658ff31591c31c7/28220159353.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/t5pp7cop5b8c7c81g4830e2np3/70983121245.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/34557677571.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/84399114819.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983df3b50b---57834814447.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+pearl+rom+hack+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 3064 bytes
SHA-256: 9d30a4bcb740befb6910128f35dac6a69573f93bee66ecb4e70e877ff36f8948
font_01_sfnt_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 4952 bytes
SHA-256: d33328c7aeaf0c46a3c23c9cd47077901ef07ca969334fe145a4f4a7c44d37c1

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