Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8afe3835d93fd41…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 21:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d092df4c4d06c323ee7d0e82d1bf1b8d SHA-1: 11638e033435c6cef22ba9b321280774eda98fb3 SHA-256: d8afe3835d93fd41a5541f634a5a735719de99eb9c99b8ca8cac9802ebbbacad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external links, many hosted on what appear to be compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=turbo+racer+3d+mod+apk PDF link annotation
    • https://bluetact.com/ckfinder/userfiles/files/59528961394.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/lanewososat.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/sagidegibaratiz.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/64269066487.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/68627493986.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/30370716604.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/86961083541.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/54407086502.pdfIn PDF document text
    • http://centronegozi.com/public/vadizu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dc343c609643b515ec8e1fae4a13106d/vewirovaxu.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/noroturawiben.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2adb12eb---xorunafigavukorukaturiloz.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/pajolinolemopezopojukuf.pdfIn PDF document text
    • http://hopkim.vn/upload/files/danudijatowopuva.pdfIn PDF document text
    • http://aprt1day.ru/file/40466068426.pdfIn PDF document text
    • http://zuche0551.com/upload/file/8385110623.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d5d292fed240b4ec665274176e3de196/sejapug.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/musapaxubepazivujutujije.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/79928203328.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/namobopefijirasug.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210912_1A1961F7720CB497.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf070bced4---jatibolulupexowivajifuxu.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/65213862286.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tuwemazanufudapal.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef697b2eb1---45258270759.pdfIn PDF document text
    • 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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 10632 bytes
SHA-256: 848e1f802d9bff457b111c200601e6ef40abd53093d142d6855ebf2b2c862fcd
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 22476 bytes
SHA-256: f58cdcfc19542f7fdb0901cc7630e414974b7c9de92ba9ae5b08ba6d7cdf2b29
font_02_sfnt_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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