Malicious PDF — malware analysis report

Static analysis result for SHA-256 634e7cf155561ef0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 04:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2ee9bfe0eb5404f550555d6a2eeba3a SHA-1: 2098c568a5e119b1bf58ff98e11cb514e35d4b73 SHA-256: 634e7cf155561ef04c8568becebc6ca0a374728842d0af1fced7cac79af22804
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=mahatma+gandhi+pdf+in+english PDF link annotation
    • http://villa-carlshorst.de/sites/default/files/file/bokurelumopi.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/jurusogimufebedoxo.pdfIn PDF document text
    • https://birotex.rs/images/files/magugigopazosikezosi.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090815323637.pdfIn PDF document text
    • http://zeci.nl/im/image/wotasuzilefezam.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631142174833090564.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/42495562293.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/miwobo.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/78310000180.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1a9462ccdde95f478811097814000fdb/99935887552.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/52587421968.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/97791955188.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/rizijepotofivuzew.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/linisuzofon.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://geo-equipe.it/userfiles/files/50249582332.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/48374643941.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/vezivexakaletazugidoj.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/luluwupeluwebuwoxisowil.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/31024766772.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613357c092ed0---45299589119.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/22d6b664c6920f5fe28afd08d7cceb6a/zufofezuvi.pdfIn PDF document text
    • http://juentai.com/userfiles/files/tokepi.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_off0000b3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 17796 bytes
SHA-256: 9c5406e87bb0e971b4d970351fd67a59086469b37d22b59bd2490220bd868e26
font_02_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 10720 bytes
SHA-256: 90555cbd3870fee4a68054272d82d85a5e3863f7a5695de9e28a72628d6bc203