Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8b76f4d54d6a61…

MALICIOUS

PDF

119.7 KB Created: 2021-08-19 08:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1e1990ce0f529647c96ec3d21dbbae7 SHA-1: 8909a071db0e5b2652939f31723d545bdf89abb2 SHA-256: eb8b76f4d54d6a618d703e3afb22a658c239de1ef7a93667197a66cf228ffbac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination. The document body is heavily obfuscated and contains no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cansuyu.org/resimler/files/25308519347.pdf In PDF document text
    • https://eklyps.net/images/file/6172538577.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a3bfcd3a5e28f498fe05f7e1dc621fb0/dofuremavi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094afe428010---mibapimuzolexifogaregu.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/43599648481.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730406c2436---60961896302.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4e14f0c6---ralazevobelidip.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/joboneni.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/xajopupuposon.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/86629018841.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/savawevebelugo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb5e277d5---70949886307.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a2175d5d32772302dcbb0852acc8828d/nesew.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/xevowijaxaluweximebiza.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/67809811934.pdfIn PDF document text
    • http://51www.org/uploadfile/file/33a4e309b940336ae9adc978e3431734.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/15460516957.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/o79fvdppomtajnaeob40a8jltu/daweturojuxo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dl6qhgbim4daemtd5o93h8hi23/gaselonogi.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/23650714372.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/o5pa3ars3up8mj629qfm5fkpg6/58697913617.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/bai2daoj57oh0f3b8gjluh9bg2/80252755426.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/vufosewumezowodofi.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/wujaseta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=did+kaneki+and+touka+end+up+togetherPDF 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_off00017431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17431 16832 bytes
SHA-256: 820014d4393e7f5a050e5acb4cd666fdb72f027c65f1a1556058d9e7dd0b1a26
font_01_sfnt_off00019f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F91 10652 bytes
SHA-256: a3df590b2a3aa099b3ce3ec0e4a793990dcd4e55b2b6155e2c5c5861c83969e8
font_02_sfnt_off0001b79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B79B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1