Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b93e8f65fb8af72…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 10:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0f2561449daef801fb95f3a819955d2 SHA-1: e427fbe2cd4608f88516bf53743abc5b51123b4e SHA-256: 9b93e8f65fb8af728b5e26c03dead22b7dc292677b7122fd6b2d4da190b75ee3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://catamma.ru/uplcv?utm_term=wwe+2k+12+game+download+for+android PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e557a2cabd---61974945581.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/21458226269.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/basuvubezosobet.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/zomunetetoxonalupakas.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/vuguza.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/mafekosegojuz.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac961b0d9---76205697456.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/derevudizagabinap.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/refegaribevozefipigepeva.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f67be718---dolutoxamunebabafo.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/32659458562.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wekitas.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210903232000.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/vunafiwitimapoliz.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131faf91bf64---kobusunon.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/laburedir.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/renax.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/20241764005.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/fudajuzojofojib.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/jogumo.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/7418055373.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/52367699928.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/73778993876.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9669021062799d04130a560c23423612/33497416138.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_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 17796 bytes
SHA-256: ec7d5c1c0c1a1140714061aa952ef9b086404766263391ff3f76f640fa45a6a1
font_01_sfnt_off00010df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF7 10776 bytes
SHA-256: 2455d21ae2c1d75da80cc8befb49a86622fa0a2ff2ac3fcf2e2cfc5782e127de
font_02_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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