Malicious PDF — malware analysis report

Static analysis result for SHA-256 896451c795927003…

MALICIOUS

PDF

91.6 KB Created: 2021-06-27 08:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6cccfd45dd3c3ffc5163b7969fc2f66 SHA-1: 9741f075df49cc8bbc15329df5286c4b055b139a SHA-256: 896451c795927003f2d141750f312565c08f81bb2f5c75ea83e5ceb6376bba1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the link farm structure is a common lure for users to click through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://drafthe.ru/uplcv?utm_term=philo+in+greek+means
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/e418f6e8117077b09c5cfb4b961b0685/mefofisu.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/v8otnup73ei2iek3988vmuctcr/xazetobakijopiziroparuw.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd2d9344b---xogazojemexu.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15d5c139e4---sugikakobitokisu.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7o8lbi13sa6bh1atikrfpm5jfe/xipugivupipeguxevif.pdf
    • http://austria-ex.com/images/blog//file/tofiluzuxogokawide.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8ecbd2f351f5dd89cf4cfdace92bc633/sozaponinakiv.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b444434d6a5---35645058010.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bccdb15796b---gatonewetavuwidikegudi.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/61489440300.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/42295390217.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3391d26e---37443718207.pdf
    • https://medtek.vn/storage/file/89001966924.pdf
    • http://lycee-elm.org/userfiles/file/80728102292.pdf
    • http://wildpflanzen-planung.de/file/53922848991.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ee340eeef2e8f74301317eab0ffcc592/vugoxilixugezi.pdf
    • http://fitviewer.biz/files/file/roxuximet.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/lrecjbnu5ofp62fjipp8kq5886/nebididulabupuwitimalim.pdf
    • https://hondamienbac.vn/userfiles/file/zesokuwewezot.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dvlldbl327726v3rh16024qtav/83496791945.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45a823c88843408cb0fb90020f6ff255/povivugujobokenamasino.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774db371e10---givuxaxokozujaw.pdf
    • http://capmar.eu/userfiles/file/ganibefikujupera.pdf
    • http://allycatering.com/userfiles/xejujo.pdf
    • http://divorce-difficile.fr/userfiles/file/23280500005.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 16792 bytes
font_01_sfnt_off0000ffe5.bin
f41e0196c281e46175753668b8b9d560e9c60db42d31147ab6fb0b0fa8c73959
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 18552 bytes
font_02_sfnt_off00013068.bin
bbeac4a08161ae9a502fd31494a5ba7c02c263d81ddb12db5d85ad65c73bf511
pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 10548 bytes
font_03_sfnt_off00014838.bin
5059c3b1e04fc85ea7f952d4c2c68f5cbbd07aee2169647fabb39265e404e436
pdf-font-stream PDF embedded font (sfnt) at offset 0x14838 17016 bytes