Malicious PDF — malware analysis report

Static analysis result for SHA-256 5089e7d245833261…

MALICIOUS

PDF

100.2 KB Created: 2021-09-03 20:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6746d328ac164c82965cb8755de589db SHA-1: 7724efd8242aa30d83466a7270c39646596f5d15 SHA-256: 5089e7d245833261ab73898c19f7d02757a8874f2f0f9dd7daba0fa01001c735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://catamma.ru/uplcv?utm_term=eugene+onegin+novel+pdf
    • http://e-cluny.cz/UserFiles/file/47029212308.pdf
    • http://drivescuolaguida.it/userfiles/files/65190338880.pdf
    • https://vresponse.net/userfiles/file/96506253184.pdf
    • http://goldia.cz/data/file/nujasemosut.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c6255f35d10---79783235172.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e74f23460---69462038986.pdf
    • http://asupuro.com/upload/save_image/files/25687590752.pdf
    • http://alhouti.com/userfiles/file/25913563819.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2566dbb1---37646961402.pdf
    • https://dacola.com/upload/files/buganinenujeto.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/9e0hktjgroei8dmfv2d6mhigg8/dujefitejenaxino.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/mibip.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2653fab7---10468614296.pdf
    • http://juentai.com/userfiles/files/xuzexelisomepoxulevusobaz.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/t5dp921hmfclurn2l3o6hsbci7/99947935142.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad1d438e40---tabexovozolaxalize.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a27b3b4a3d50bc6e1e8abeedfe501045/50775085857.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bae18562df0---buruvuzugijarezedaw.pdf
    • https://mannoorpally.com/uploads/file/dopumulalovurewogotijedaf.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/74714790599.pdf
    • http://samtle.net/ckupload/files/96444522905.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160ba69cc18e1f---33212353499.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e08d559f0---wugupatadekiteputatali.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7cf80be66---kilufalefamebu.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860df251af4---fetim.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_off0001205e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
font_01_sfnt_off00013875.bin
dd36872d01b8dd2366c4b7edcf825216d4292054d60afc17b42e898dc338f6de
pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 10296 bytes
font_02_sfnt_off00014f76.bin
7c14b1fe3abc16cda5f5b5452c7774f505cfd31e4b011509e5ce9b4a35607c70
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F76 19868 bytes