Malicious PDF — malware analysis report

Static analysis result for SHA-256 daad5cba0bd69f9e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-10 00:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd114556a423c6547e7e2224ac33f670 SHA-1: 6cba9b4a96fd625fc49893ba9d6c00e352020a79 SHA-256: daad5cba0bd69f9e03002d3c8d0b3ebb9d3732a5fd46650e9b973641d2a20e29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to disposable hosting and compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gfzgt.ch/upload/file/dozavowazikiwatete.pdf In PDF document text
    • http://vodnik48.ru/content/file/xafubovamakilejurotudekid.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/wizaduruzemarebafatel.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/biwuzizufuge.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/9948cut8nkg6mi82jttnk04k37/bifotomulonivepo.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/zozokipumuvejurapa.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tezedaje.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136a38cea4e2---resulesuwel.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/44574579517.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/21179578031.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/fujaruxat.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/vuxivipenetil.pdfIn PDF document text
    • http://elsped.hu/files/file/10736049019.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/60429497116.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/kotizetidiloget.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/kewirelavegosenupakil.pdfIn PDF document text
    • http://hexindechem.com/upload/files/rafobunexajego.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/lovogugiti.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/27989393376.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b70ba02e34b4d793162721a2756e5e96/lorexav.pdfIn PDF document text
    • http://fpole.ru/sadm_files/tagaraximejewipamidazuji.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/xofositebib.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/87290538128.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/vuwefaluzapiguwud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=balloons+original+web+series+apkPDF 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_off0000bafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFC 10700 bytes
SHA-256: 995e43077b9d7230b47de1bf45eceb5b97df6c28e7248f114da594225faff377
font_01_sfnt_off0000d386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 17436 bytes
SHA-256: 18174d8f8c99a9fb276dc1ef5367466c0754b8f43da228bdbff45bc9457932db
font_02_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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