Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c04528c414c745…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 03:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb60da23703898211109f90979602c7f SHA-1: 20daaa4098053f8ad563872a65d30917094caa33 SHA-256: c6c04528c414c7454500a6fa9e2f6cbdc29f2b072e5fd740ebe062a0abc54982
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content or downloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

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://bygreenpure.com/userfiles/file/nuwawoje.pdf In PDF document text
    • https://sealand-pptc.com/userfiles/file/loruxevotamolaf.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613781767d980---63088704471.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/64700035535.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/90036200855.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/tukidosamogiwobuvotuzuxu.pdfIn PDF document text
    • http://africareview.in/userfiles/file/66180444685.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/30095791074.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/83268906108.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/57395737920.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/zumegutituponugojaxoni.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/refevubutuweguzixezep.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/vopeg.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/zuvavu.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/vatoxomiwodetazitepok.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/94212730420.pdfIn PDF document text
    • https://gameclub.by/uploads/files/45160471084.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lepolugovosup.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/10010856725.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147246e3ee7f---39163164158.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/jpj9m8havilq3o3013kk3dk3a0/11239417030.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/pixiwabesi.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/zepajadafalikapu.pdfIn PDF document text
    • https://maria-galland.ru/files/file/75404550882.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/25258623666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+diskdigger+photo+recoveryPDF 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_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 19732 bytes
SHA-256: 84b892d55c6815731309676630eee9a72540d89681c73b16679ce95251fa6974
font_02_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 11152 bytes
SHA-256: dc8cc98e3e49c40c2ecbbfa57fd7ddf704efc545a73da5c68002685f16a6eacd

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