Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97647098e1def30…

MALICIOUS

PDF

70.4 KB Created: 2021-09-30 23:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 336431e00d9f23625a2b0ecded04c6e9 SHA-1: cd3a60e954152857807d2f92593b86c6a890de9a SHA-256: e97647098e1def30400c68134ef08c67fdefceecd0c7c7895f4c6a6fa1df88ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://smidgel.ru/uplcv?utm_term=residential+phone+numbers+brisbane
    • http://raegcafe.com/uploads/files/rokepofatiwejodef.pdf
    • https://lp-tracking.com/userfiles/file/50186805666.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614c033003b5d---45065552809.pdf
    • http://ciarajewellery.com/editor_upload/file/fozisogamutakawavam.pdf
    • http://hwangtosidae.com/userData/ebizro_board/file/bugogodabuzifasi.pdf
    • http://abwclayton.com/uploads/files/90738123116.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210911223137.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148019d56e5d---lafotoradegunotixitol.pdf
    • https://music-group-store.com/upload/files/xavofamakibijakogol.pdf
    • http://ambulanceservice.pl/userfiles/file/maretuvetewegafilawor.pdf
    • https://sayurmateng.com/contents/files/47439766812.pdf
    • http://grafichesirio.com/userfiles/files/nuririlisoxe.pdf
    • http://asiadomainstore.com/userfiles/file/6794834199.pdf
    • https://yarpaket.ru/userfiles/file/bobetalerapevudikoxa.pdf
    • https://athenaeumchessclub.com/ckfinder/userfiles/files/kafopewimud.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b33f0f2e8---21938961579.pdf
    • http://sskj.pl/userfiles/file/33210542866.pdf
    • https://berettyotv.hu/userfiles/files/dabakeragimajutetegixij.pdf
    • http://klenderbio.com/upload/files/83630487665.pdf
    • http://sooam.com/files/fckeditor/file/14732511676153850d7d549.pdf
    • https://karolinanowak.com/userfiles/file/xabejejarimu.pdf
    • 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_off0000b0b2.bin
15228bf0602c7be13006d8298b7af88677dc7104267e5a407dd5f38939073be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 10944 bytes
font_01_sfnt_off0000c991.bin
ddd032f3506c0ac492eb1e1de3e5c9c264ea579abc1a91f9cfbc711ef044ec97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 16676 bytes
font_02_sfnt_off0000f3c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 16792 bytes

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