Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a0e67af2e335a6…

MALICIOUS

PDF

88.7 KB Created: 2021-08-11 22:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab968e05ea0b9086dd6c0b53e60c93f6 SHA-1: ae963e6621e9583990bc02395d0ff9ff89b793cd SHA-256: 84a0e67af2e335a652ec290a24f48d3ba087b5edfb304bec2d085249c509a949
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The presence of numerous links to PDF files on various domains suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://hotelbellevuepalermo.com/userfiles/files/56426488308.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8c0892654e26f54c5c4cf56a32ba0286/dubediwupamik.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091126f01322---venul.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/90269200de96034ec56bdef98daa98b2/refubiwobopewajutulebapu.pdf
    • https://decoveinvestment.com/userfiles/file/23431235888.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/ritugud.pdf
    • http://dentalcenterstudio.it/userfiles/files/popoj.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05066d1fd0---92040456966.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b9ec96846bc5072ada69644e9b41ed9c/gamujakajidixetoledug.pdf
    • http://www.rify.us/cms-uploads/files/24333767806.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/4db7a5971f8bd75cf1a154648dc42919/woduditudetajewokubuges.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/c323f467f29efa9f32d7a1822de22f6d/tabemesunezativa.pdf
    • http://everest-c.ru/ckfinder/userfiles/files/jojaguvajadubireriberew.pdf
    • https://ustunbilgisayar.com/userfiles/files/94587924745.pdf
    • http://standartbio.com/fckfiles/file/72156937785.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ff56712b---wonojuratubito.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c229775bd---febuwu.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7706cdc5f---xozorijaxa.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd76df45bd5---kaxofumepuzo.pdf
    • http://shadesvalleymounties1969.com/clients/868959/File/17220469717.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5995e80f2c1f6e18217aef9736297b7f/vigexodupag.pdf
    • http://alexdisinfestazioni.com/userfiles/files/39958359192.pdf
    • http://monroehighwildcats.com/clients/40160/File/95887191641.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609209f8126b6---bogasujojokik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+purpose+of+russian+nesting+dolls
    • http://s250801404.onlinehome.fr/img/uploaded/file/74321371691.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c7.bin
dabe6b6eed176657ec2db0316189ad83d3f357a56aa342729b4696d18c8bc50f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 10872 bytes
font_01_sfnt_off00010ca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA8 16792 bytes
font_02_sfnt_off000124ba.bin
1a9b5124ad2fd60179823194e40da19a1dd1e18d2c57f22acc3fe3ef993b2176
pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 18728 bytes