Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d234e07fcdbd63…

MALICIOUS

PDF

82.8 KB Created: 2021-06-18 19:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f46b96689da43bc8ebba897f0bcd0c5c SHA-1: e18a3d33bcbf2c1cdff74d1372dfd2d3d7fa0c16 SHA-256: d1d234e07fcdbd63b409e909282daab08560af8fe43524e350b710dfb3bd5b97
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, redirecting users to external sites that may host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd783e3c3d---kipaga.pdf In PDF document text
    • http://forter.vn/hinhanh/file/rinod.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/p1q73k93cca0uffoqo2sm3ql70/kejagifowegoji.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rroejlo0t8m0d4lp3mgtbh2mt7/jenidejetirosol.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/falamobususasesibawesunip.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607624f821358---76956194553.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/pebipabozotafilozebilu.pdfIn PDF document text
    • http://mp-journal.com/media/file/sebug.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9b81c637900b33db18d253e9dc1c6d41/87323969159.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a7849a9d8ec585091694dfc43d8cc3f5/jikojejusolutubap.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/gulapalomopuzejewufutoja.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ea711424439774ff4eff636671c554b4/6060135836.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad77e74fc38---sajizorakozexunasokude.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/51166419.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609730a0aa69f---mokonulexumisefafunaped.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f0924cbb704a816e4a0def644562d8d0/58356096356.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/051b2ebef6558f3d3a13791185863ae5/podanip.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/FevRqgeaUVY/uplcv?utm_term=bakemonogatari+light+novel+english+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 4968 bytes
SHA-256: 3229bc53be1c227351fbea6242b0d6821bf983d664f030ae543d9a8968f7b4f7
font_01_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 5628 bytes
SHA-256: 05bf3358ce797ac60e5aab22507976626d460c73bef5706c47cb191471e5eb28
font_02_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 11600 bytes
SHA-256: 368d141141545d719f6555cf174f875cd038ed16d582bd42c2be42a4fc9a8534
font_03_sfnt_off000126a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A8 16164 bytes
SHA-256: 3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58

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