Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf5e047036d78be…

MALICIOUS

PDF

73.4 KB Created: 2021-09-10 02:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 25f1246e981ce553e490a49e59caa2cb SHA-1: fddd206fda466999db30b1b9004b4af8fe790642 SHA-256: bbf5e047036d78be4c3b375368ef3dc76f126fc7ca2bde373ed3b244ffa80e72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and a link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://criminisiepartners.it/userfiles/files/rekogogabufelovu.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/b48a7843514859c7080fe0a994acb6a3/47795748962.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/57823045520.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1ffeedabb0c8c792a93efada7ed29e30/wowuforodob.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/5574170370.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7557e52d03c97103b7a3b82d04b11464/95582807271.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/veraxanufokelila.pdfIn PDF document text
    • https://baongochoa.com/upload/file/13133065049.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/jokufonutawaj.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613613718ae11---lideri.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/sujotonofin.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/96683099427.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/zebunim.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/40174397066.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/dupororoxe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135309040033---24518772860.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/75649601488.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82bbcc4a7---ledogagejizonutogup.pdfIn PDF document text
    • http://erpos.sk/data/files/26630562571.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/31738953234.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/dojogixibunogoraj.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/29463608458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=decompile+apk+to+source+code+android+studioPDF 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_off0000bccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E4 10868 bytes
SHA-256: 08949579e25f174d0711c31a8abc8df978f881f4cf77a87779aae108097904e0
font_02_sfnt_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16496 bytes
SHA-256: 75195e3c1494f0eefdd42f452e8190c8029bfbf173a73034aa6422d833e416b2

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