Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb6288c663ab2d2…

MALICIOUS

PDF

91.2 KB Created: 2021-09-20 13:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8126f304f2b30d27ead34e905a15e1ff SHA-1: e1d623de7a6d16f66873d08df05622515a2207fd SHA-256: cdb6288c663ab2d21dd122a5442c77168d2b752672388a00c569fa9bcd487f99
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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
  • 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://havadisname.com/upload/ckfinder/files/47983480765.pdf In PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/lawutupusumi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/l3nam17ioitmo4t76u4qk7o1ss/fikigitamar.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161428cf5f1421---28691017301.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/gebogemukux.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/25025872514.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/76589571193.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/fipokujozijediwavavaweto.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/93424122638.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/78747204308.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/32146792659.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/vuxugelevivuwaweruti.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/bifenixiwulomibupumupu.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/34464397198.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/17952584597.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109111417195946.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/datexonazo.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/kawewexekujimipusovut.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/nibawutu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161434bc33715d---90431617825.pdfIn PDF document text
    • http://coachhouse.info/assets/file/89549926970.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/dilaw.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/25389352931.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140d46c2e232---18216529343.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4904f3cc---80154229401.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/17532113152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+spoof+appPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC1 10276 bytes
SHA-256: 572692dd0c67fc388ba3bbe11b0e2110a5e1e75d848fba43c3ecebc4e869cc0a
font_01_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 19884 bytes
SHA-256: cb8c9d5b78c3cf44ea6a209b57f813e7da08d2073663abaa1f644a2d82ed16fa

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