Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c6445974c371e9…

MALICIOUS

PDF

87.2 KB Created: 2021-06-26 21:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e103f71bf8b1285eaf593c72c616f45 SHA-1: 417bf3b7aa1ada23b02115ed52f1837986986def SHA-256: e8c6445974c371e96684edb919a53672e94cd48014328a394cbefb6c0e446729
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The presence of embedded URLs and the structure of the document as a link farm support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yachtandgulet.com/userfiles/file/58123876407.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad460950d5e---rowonivafuxanuxivazani.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e193ca19---wimefojugafolomaz.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16070be6e53162---46814916843.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e9005d99---96607049838.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1e04efa6---pebizunipoforot.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/54893834492.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093deaa28186---wakiwuwexopedidubav.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/nuzuribivupo.pdfIn PDF document text
    • http://honghuibio.com/d/files/fovenufi.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/vegajude.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709a7fbfa56---66510115847.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tudugu.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e97b2e9b9f312afb1465fea9272c53b6/ziwafijitaja.pdfIn PDF document text
    • https://brs.jo/userfiles/files/sibixazurodidikovixuzegek.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b85f7a534---30516844303.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb4a0dc00---19581100043.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ou9d1gb9qup3ndtgv4h6k39232/sowux.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/446797510.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40a80ed83---68983639642.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/fowupuvofu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160901cc25fefe---ruwexipevuxowikikan.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/35427132146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=real+numbers+lesson+plan+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/706a81a927b78186effbb826d7c893db/nejurowipaze.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_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 16912 bytes
SHA-256: 9a1b44f642c44c26c35c5310a31408d3c7247c7dc3e60039b8bd54546e9e1fd8
font_01_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 10756 bytes
SHA-256: ca480d868d0155d3fbc019ff25837e2605bb92742e1ce9ea79883e9ca5f0ba8c
font_02_sfnt_off000137c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1