Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c95284c46d3e2d…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 12:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9e8d6c568e17d116c5337fee37b52c36 SHA-1: a86d64e282e0581e795db560fbcf5c236009bc0c SHA-256: b3c95284c46d3e2d6fc60d38d54ad56f53ca737e03798821e4542fa5e0555e5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The `utm_term` parameter in one URL indicates a potential phishing lure related to 'ram expander' or 'apk download'. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=ram+expander+no+root+apk+download PDF link annotation
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b97a532d---jatavurefebamebirazo.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/jemiwilijetirun.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/bojivimesusaz.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/bebedunijida.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/58137386650.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021912133643461.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/50948501474.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/66446110742.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/fejowax.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/badagepedevujevewun.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/sorix.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613448ffea9d6---54395439746.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/wekukan.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/83549883831.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/nexazamajamadetoj.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/xewegigedowizuwigaf.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/kixubabozalan.pdfIn PDF document text
    • http://infracsap.hu/files/file/82058938922.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/93682367218.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/75686427102.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/1tbg80c74b7h22l7la09370flp/pujodamaronex.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/85477967922.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/gafor.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/31278808356.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/36763703765.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE500 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_03_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 21216 bytes
SHA-256: 9de6c513fe86e163c754dfb959d756e650cebada4c918584e4216ef9e8c39346
font_04_sfnt_off000138d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 10620 bytes
SHA-256: 0bd2ce426f1c89b77ca0c499cf6b4a2f3e038894722356e59773561abc6fcb47

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