Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f9634a4849092a…

MALICIOUS

PDF

81.5 KB Created: 2021-08-31 09:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 574f4a8a98c9be28d98bb71e23d8e0f0 SHA-1: e02c4d4aad4c2f2b5e4a2f02bb56dee663d27b1b SHA-256: 56f9634a4849092a6cdcf9a87010193136817c42eaa91cff4d1f895955509472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=thinking+fast+and+slow+bahasa+indonesia+pdf PDF link annotation
    • http://ottotech.center/userfiles/file/22690111535.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f4941e140989630ebe1438ef2b457183/96945976864.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/mivugosoz.pdfIn PDF document text
    • http://labonscafe.com/userfiles/masolal.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/salotuwafekoseviz.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b690e531caf---47809586604.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/xolipelejozuzu.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/pevejogutujexana.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105020824244476.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/6802595425.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c9d285d43152b4c0c0be3dc38209417e/sapotutiti.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a96bb976d33d7bf2864546916b2141f1/93139285109.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/tuxivusel.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/fateparagedoz.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/rapofesefuzikijovikuga.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/gelararirax.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/c9ce496d5ee02ec24f71b12622d8f662/subexirigapofelogup.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0c6af3506---56025086866.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c13322a3d3b---felevizasajujimapu.pdfIn PDF document text
    • http://beta-rc.com/upload/files/65114923234.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/rejawonolavotadiv.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/10667670312.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/dijerufivonawupukum.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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 18012 bytes
SHA-256: 3aced18691094bfa16d51f47ce0e490b7ebc939462fd8a6816394802ff4d4e7a
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 10956 bytes
SHA-256: 388ad4650b2c703d51b09eec31a229b48efd3e54321b81855a95fe34e5a00726

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