Malicious PDF — malware analysis report

Static analysis result for SHA-256 80814e36256eaf22…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 07:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb3276ac09ddb10f12b5a28ae09dc22b SHA-1: 762c2aea2333324f0b25fe9fb44d26cba3572774 SHA-256: 80814e36256eaf22dd2874c9207ec931261bc0c3ba3c7805669431ed84c91115
156 Risk Score

Malware Insights

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

The PDF file 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 potentially compromised or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://sk4education.com/ckfinder/userfiles/files/kujosolivuditexugulotil.pdf
    • http://ticketsperiodico.com/galeria/files/sarelido.pdf
    • http://fsf-vastroad.com/userfiles/file/sivimaweliv.pdf
    • https://lose-weight.tw/upload/files/tilurunijaw.pdf
    • http://mondoacquapiscine.com/userfiles/files/51158959035.pdf
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/40239109401.pdf
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/dogilegun.pdf
    • http://theorientgarden.iorderfoods.com/uploads/files/24644012029.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441ef713710---63791134592.pdf
    • http://qianshunqs.com/admin/upload/doromewewubepar.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/00d8a6d35d04e08205f13183cfe37033/sadefunajixosokir.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444266a8c78.pdf
    • http://rollfactorytogo.com/uploads/files/voxesiko.pdf
    • https://verandapattaya.com/userfiles/files/nubokufenukisenumive.pdf
    • http://hightopeducation.com/cms_uploaded/file/giruvo.pdf
    • http://ct-tci.com/cttax/userfiles/files/68835522840.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/pudufepeliborabedekerudot.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/635367560.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7f0bc991---lojufodipexi.pdf
    • http://mansiya.com/uploadfile/files/pumepilakimefekimad.pdf
    • http://leeclinic.kr/userData/board/file/145874093.pdf
    • http://german-ex.com/images/blog/file/1416589178.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/14403372536.pdf
    • https://cursosadistanciayonline.com/medios/files/jigimujo.pdf
    • http://www.mustwalge.ee/data/content/files/30483831229.pdf
    • https://soudurelausiere.ca/upload/editor/file/68988844770.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394eb9b4a05---tilebufitux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gta+5+android+data+obb
    • 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_off0000b85e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB85E 16792 bytes
font_01_sfnt_off0000d075.bin
37567d851e4fc4596f2679a9ec27c6f6bdd10373de7a1956918a43b897b04ef7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD075 10208 bytes
font_02_sfnt_off0000e77c.bin
61a7f814da253a30d2efe0040ab169b2e06dccfae6093e7de2a29cc8663dbeda
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 15864 bytes