Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff680d06d98c6884…

MALICIOUS

PDF

72.1 KB Created: 2021-05-19 18:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ebcc6ac6ea0046e1933e07e976fc36f SHA-1: 6254ef2abee4e1bb473f02e1c2666fab5431d055 SHA-256: ff680d06d98c688434f7471ff86620551750cbc053950d16dba63f36db61cbf3
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://irlanc.ru/uplcv?utm_term=assistir+o+hobbit+filmes+online
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d937981f0---89079595633.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be298657f---7027590588.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/67b07067d6c0ecc9b0996a350cc3d2fc/maruvubep.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ace2fbd7d3efa2f18a42ea9de1008e44/69918166422.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4e66890ea---jaretefes.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a19ee7adafe---jusor.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a81df46eb515d49e2216bd859259506e/51558648066.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091003dd94f0---1305025916.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/79bafa2a28f22e58a939340fb0b2a6ee/84031607693.pdf
    • https://accuratesearch.com/userfiles/file/wotijajulukukeno.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16096b6ee8b1b0---kasakinotajopozanoribev.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbe902334---63322296375.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84cf246e2---97123802313.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823ac58ce35---lejuzajitod.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/ad1b354533c8812dd9b23bdbad05853a/levutajewumifisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e064.bin
cbc2210b55678ae60d4d2f1b0b87c787610bc4a054cfa57b5d6d7e117d326166		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 4712 bytes
font_01_sfnt_off0000f036.bin
a7a4490a9d23cfe7643a8fcc62c01da9c3d7ad2445c4abcb0de4a48764e9e769		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF036 12432 bytes
font_02_sfnt_off00011646.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 4324 bytes

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