Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db457885f06dc83…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 02:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ac7bfda68bcbb5376f0f96afadb818c SHA-1: 3b350babed68cf335651d63469698eb78d54d40f SHA-256: 9db457885f06dc83666f8f33e452e5ac160e780d18fea4d982933e774c81c9f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f066342880---39746982714.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138158d746bb---tikobarirufugenokiba.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/titafevi.pdf
    • http://getvisa.ru/images/File/97049323785.pdf
    • http://lorichphoto.com/pictures/file/zadizigepin.pdf
    • https://thokhoavietnam.com/upload/files/verobumexeseruzuropefif.pdf
    • http://kbautotech.com/board/datafiles/imagefile/79767963633.pdf
    • http://curvesncontours.com/userfiles/file/62965126929.pdf
    • http://lg-palette.com/upload/files/43141475312.pdf
    • https://art4you.sk/editor_uploads/system/files/56509466073.pdf
    • http://wwsm-us.com/files/file/30490011365.pdf
    • http://kapelski.pl/userfiles/file/zawinolik.pdf
    • https://tonitomov.com/picture/file/migiwunabewopalevim.pdf
    • http://webs123.com/userfiles/file/lebijoxowidedipeju.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/07b57ace7cd6879f2750c5517902826e/85022871641.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/48744992517.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613e864f85773---tesadozog.pdf
    • http://altronic.pl/!mag2011/userfiles/file/wufabixux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bajrangi+bhaijaan+full+movie+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad3f.bin
e33c57d42f9635c3a56489636b75c5ed5bad4bca63df14f8ea9831de82963799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3F 11112 bytes
font_01_sfnt_off0000c6b9.bin
b92d13314f7210baedc49e16938bf2f2ad76b87350bedc5e20da1e61808664db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 14884 bytes
font_02_sfnt_off0000ebe7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 16792 bytes

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