Malicious PDF — malware analysis report

Static analysis result for SHA-256 533492c3c6c7decb…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 08:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3459dfe8e00a5714dac1ffadb3d39019 SHA-1: c2db9e4e4edd2111abf49cd6459222931bbff367 SHA-256: 533492c3c6c7decb2ac0bc369e57907f1df674b2f0e9ab82fdafb4dffeb91c40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm designed to redirect users to various download sites, masquerading as a search result for a game. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit user curiosity for downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://aglogistics-bo.net/userfiles/file/labonaxijebokipulatusag.pdf In PDF document text
    • http://dreamwith.gni.kr/ckupload/files/sebidasakokikigukez.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/11446999915.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/bizidoloranorigagik.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109050856157580.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/82769357348.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/83945296976.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cef5b16e9---lavawagekewapoxibotaj.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090106080573499.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/katujejikorununeleko.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/bojosofewipiresavejediz.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/katumex.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kuminemesi.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/54620367979.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091220293373499.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/jugasusip.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/46612600240.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c190ec5553c4c2d37bacf4a186059082/sujomekedamo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613594dc77b07---niniwogigagaxegenunubeb.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/bibos.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/fatejubokolaziz.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/305994261.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea53415411---tatuzazurujapaterudinunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=naruto+senki+download+2020PDF 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_off0000c3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 16616 bytes
SHA-256: a5041d5f378fc4d8db0f82a459a015f47c5aa976e62193a62da034dc0ec06d43
font_02_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 10740 bytes
SHA-256: ce14dce81d22709c36d71b0b77b37dc79ab6fa16f5642713794931ba7176f3d0

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