Malicious PDF — malware analysis report

Static analysis result for SHA-256 902ade378c66c65e…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 07:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ba4e297babddc3b932d348347709190 SHA-1: 134615b312043a7a902412848fd97c27414266f9 SHA-256: 902ade378c66c65e62edd48c3a5c532f820c7dd6f05e39ea7ae72279b424ca85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to various download sites, including one promising 'gta 6 android download apk'. Several heuristics indicate the PDF is part of a link farm hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=gta+6+android+download+apk PDF link annotation
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb72195515---wudogexufawoxewilariwogew.pdfIn PDF document text
    • http://szwygs.com/upload/88513818733.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607225d5b0189---84249085939.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0810c88eb7---54668356842.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cdcefa30a476d3ee82c2f34839121e38/jolukaviwuvoxokiguvepime.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d9a813c00---42184104141.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/jpu2dj7mqnfkvrruf2shh8lnr3/purerodeboxinegage.pdfIn PDF document text
    • http://1careglobal.com/upload/files/88326785275.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qro0cs514vk1n4tkq0hlj6jp65/lirabolovixokos.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210510/file/99146442556.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210702061933_ayicpf.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/6597196701.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b18e8223e160a7389456e89688e01e6b/19559149461.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a803028948f---seloferugasebomemobudive.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f61eb2426---14486261726.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/90403430430.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/55b695086dc6768844d8721cdba14a26/96635241359.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160814c0fa0cd8---2153804068.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/25111139905.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/wewurubamute.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a487ebb7---9062001818.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095b9d1289e0---defikizejubanu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffebd322a1---fepujarerirebewib.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/71162396617.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_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 16940 bytes
SHA-256: c5cef520930477dc43349bd3fd0098b6e4c3ba8fe1f44a571ae95501d1abb746
font_01_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 10468 bytes
SHA-256: 68b9660a66aaec6f6fde7a48e8e95614518603e8d90823d63c806e2853ce547c