Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6753cc8f94de3f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-30 10:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7460ce892b83981963295fd3d65bc91 SHA-1: 29352fb618364d128062cf3e1011fb827633f3dd SHA-256: 9b6753cc8f94de3fe689dfe63b35a587036734932b468bece4474ebff4271232
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, designed to direct users to external content. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to deceive users. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613d907a7c6b1---vapepupisuvun.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/21934750708.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/29179256220.pdfIn PDF document text
    • http://aven.su/userfiles/file/19672149168.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/15199894944.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/vafiv.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/vivisazesupafigepivo.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/tofawaribuzosir.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/kiwopu.pdfIn PDF document text
    • http://elsped.hu/files/file/86356882668.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613032e1c8e53---jetaxudivabewufefev.pdfIn PDF document text
    • http://didopack.com/files/febotaloweve.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/40494542561.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5f69461d4---susavamegivivita.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/76627853420.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/majapuruneva.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/murovirenopixitonud.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/nibaxudonikawatonereno.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/rajivurog.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131980f058f9---10272771850.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161516459147ae---dudixabimisixopudenu.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/jexaxemasesalarikapo.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/698974827.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/55104660760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+download+omegle+video+chat+app+for+androidPDF 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_off0000b66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 17424 bytes
SHA-256: 6a4ec48759ce0e84acd268b49db920ad63e479b80428f8f3ab2ad7d0dac2e0eb
font_02_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 11028 bytes
SHA-256: 3ea620e0417915016f6b68a068b9a44318d423b8525bcb94c687887549ddb21b

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