Malicious PDF — malware analysis report

Static analysis result for SHA-256 e605161815b13880…

MALICIOUS

PDF

138.6 KB Created: 2021-07-23 00:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f87d2764058799622e318bc752a3d7c SHA-1: e699d47b0e75d9d2e7a5cdde7122d90982a59390 SHA-256: e605161815b1388070d38e5531ed7930f66f45e454da9fd3ae419565ece1f9f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators suggests an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://arslanemlak.com/E/file/28631485892.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0b0je584enilkelmp0qnmdps41/kixep.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/famepu.pdfIn PDF document text
    • http://technocom.pl/editor/file/dagivuxasugixogufuzotakak.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/77925724018.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c741197fb66---sefedafalid.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/48612591755.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/36110654188.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b271d65eb5---kivinavegofukiw.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/subafigekemik.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2c5060d1e9abd0ce73fe774929988cbd/jamotuwonomef.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52a5169c62---wiromag.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f501cee6---pujawuruzazirenubuzutas.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/gixudawoligiperexolarof.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/cbhjkh7rp0qbnqvdn48clhpal9/30313611768.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/65656981863.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/baxopenupotegalonujegedaz.pdfIn PDF document text
    • http://keramann.ru/uploads/files/ropirejeximawofo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b38f230daa0---63309888881.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d78a8f2a93c---rugazupukugitimisone.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///vonapotujekoxolutubivaj.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8c709e81---17094218739.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/44d3698fd4dcc06f5b9ec27e55f72de0/20281995010.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/m2gbp2p2qpt3gpnmeehi32t9o1/bexes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=mel+from+america%27s+got+talentPDF link annotation
    • 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_off0001b9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9BA 19316 bytes
SHA-256: c376d4b4e237bdcf2cd0aa2cea9aaa69d3e35635dfcf9d7373788c5e6907ad1b
font_01_sfnt_off0001ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20456 10704 bytes
SHA-256: f5174a18d52005bf67b955d907131df0d096141a30f9941ffa74e6fc0c16aebd