Malicious PDF — malware analysis report

Static analysis result for SHA-256 863e6d8b4edc206d…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 17:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 178db41ec9f266f8738b885f75bbb449 SHA-1: fbbfcbf7beab00ee72b7d5b3e3fb32448785cf96 SHA-256: 863e6d8b4edc206d9d94654196ce8ef1cf7d7bbb17aadaa1823083b68710dbc6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://pune-india.info/userfiles/file/sabovonoguxununugarad.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0fdff75f57053f95d205a234ee1af221/gugeje.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0b979f0b---24250316593.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/dugujiwebivoru.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/miparobotenelebarunedonab.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sagipe.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/71470654641.pdfIn PDF document text
    • http://fpole.ru/sadm_files/welizifopefodo.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/11129737472.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/kelazomikuvidirug.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/zefakawebiguxalebaleg.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cfca6593d2c209a019af98c6bec1bb38/zibubuda.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/favaniduw.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/julenibona.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/1phspor1vib62v94serg4cj929/gapot.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/badeludezetedur.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ddabc39a33438c5193b7d811d6b988d3/59594295919.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/judonesojaruvin.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/86741159647.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/20391483187.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/lowekevotifefemoligufopo.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/kadekufedi.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/79018036903.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/86382928911.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210905090157_1761985808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tubemate+video+downloader+for+pcPDF link annotation
    • 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_off0000d1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BF 17172 bytes
SHA-256: 9b2b522188a1b82ebde057e94e9e9c6ed9b2c6531effc5faf2a72b935d25b2a0
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 10968 bytes
SHA-256: 2d8eb17f6a2d3c2a5cbde088599b264e16d93e869e59dc9915d5ff83763fe786
font_02_sfnt_off000117c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1