Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a8b484cb7b87ab…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 20:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a345a2987f74139a21ee9bd065be7cc SHA-1: 87dd4606165633ebaf871bbc9160ff8fff93ef85 SHA-256: 30a8b484cb7b87abe664c632894e18b7a7fa764a5e89b3f165b9e850092ad259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or malware distribution PDF. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URI heuristics strongly support this attack pattern.

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 https://smidgel.ru/uplcv?utm_term=importance+of+articles PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075791ebf91a---musuxokumam.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/lerolitof.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/miretapuvegetekuzejexo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609860cf80621---sekexuvigazorid.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/92bbf398d87373e61fa4611bc36305ba/17029140877.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/97464546796.pdfIn PDF document text
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/fikedogugipiburorezebibop.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/13143999280.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/9310136186.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/morepu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e426c2706c1---wuwewalasisetuwif.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/352dc3a536c1305a32546ea2c13140b8/wuvujevirixibogebi.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/wezusiwolurobepeg.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/udkfpv8a546dq0oqqkf1sececg/semawuniran.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/f6a939e381cc3e6200017a1e20a7c781/wavimasifa.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c339ad1a18---razupidaxaludu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d2858f1e54f5665c947b4150b2ce784c/16779732820.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6b1bcd12544778b5a5e5429799f5adb7/kufimakupawosogum.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/pekurimej.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/12571731786.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f8f324e83a08a29e1931b296750bce50/96980110792.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/ruvatapuzi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d2b54365cd37539734910c590874d47b/85418137834.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/89066825821.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_off0000ba65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA65 10592 bytes
SHA-256: 28127864b78bba73e68666869fe97c2dd4ec0df4c02b582132322268fe622271
font_01_sfnt_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 15860 bytes
SHA-256: 6a6c0f2f755536c3528e594befd65d8e38996dd41d6d2c51d0ddb80c74c84b92
font_02_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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