Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f828a68a4f5ca4c…

MALICIOUS

PDF

84.3 KB Created: 2021-07-09 13:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14cbefc5f48e3bea996df33c04bee409 SHA-1: 97acbe493ff887c758b46aaf93a625f6959d5245 SHA-256: 9f828a68a4f5ca4c1a4781d77ad00a9474e788ad25e4bf61a6b626474d244535
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The heuristics indicate it functions as a link farm pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for an advance-fee scam. The embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to trick users into downloading further malicious content or engaging in fraudulent schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://ketchas.ru/uplcv?utm_term=your+best+life+now+pdf+free+download
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c3179531---joxaromorivijefubuz.pdf
    • https://alakharia.com/public_html/userfiles/file/jedarivutoridepixeveboku.pdf
    • https://alajuusa.ee/media/contents/file/pisupowi.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/pejufina.pdf
    • http://al-bandak.com/userfiles/file/mejifebewuzemupusobajo.pdf
    • https://asthasupermarket.com/userfiles/file/54282012459.pdf
    • http://anatolianlgs.com/userfiles/file/renuvuzibidikejakome.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608764c1a8c80---wexizexebipulaxebab.pdf
    • http://vigova.vn/Images_upload/files/worovomumotoj.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f485ad09---safewopariwokevimisedaf.pdf
    • http://vstarmp.cn/upload/files/20210621_190915.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38f608be3---99752742267.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e7da6a81991---bodubigefowaxapi.pdf
    • https://aksukartela.com/images_upload/files/80230352782.pdf
    • https://weddingitaly.jp/images/file/64735618257.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d1584e1de---76434913062.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef7a00e78---gifulokunujazofodarab.pdf
    • https://oncetrabzon.com/resimler/files/88366524703.pdf
    • http://allmedicus.com/userfiles/file/98620679855.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a64ec6a9e7---bigogataxotakumuvinasibu.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_off0000e799.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 16792 bytes
font_01_sfnt_off0000ffab.bin
4ac9b41bc54ad780826197b875380e1e58c23f14a618a8732beb0363a7845d2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 16660 bytes
font_02_sfnt_off00012b44.bin
985a8d66c3a4a36472dab1e7b38649eb1affde020186f34c9f051dd30190f668
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 10800 bytes