Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0a3acdb0009d26…

MALICIOUS

PDF

73.5 KB Created: 2021-07-14 08:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ce05930f44b921a23d8461ddf2a464e SHA-1: 9dd1842971776785277deb0e873c1481fd3738bb SHA-256: db0a3acdb0009d26dd5fc645dc3b632fb9df6d106fb39bd7d75f970563bd9744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, including WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://krisoc.ru/uplcv?utm_term=oh+the+blood+of+jesus+song
    • https://okinawa4d.com/contents//files/zinagojemawukujado.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/1c7b0e3921756965d3568ad8b0020549/buxidosimurukafikobup.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1uoj6ghhqlrtm3iheqmnoga9dl/munizapa.pdf
    • http://falerisztika.hu/tmp/8539160498.pdf
    • https://aeternoplanning.com/ckfinder/userfiles/files/65649420828.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e5e5a1ec1a8e8d37fcf2d75335fa93ad/87568341131.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/87c6b681e26985a57d1ce8dc976247f6/55288860730.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/r70n2m7f11n8v076mhmk76rv91/36626465357.pdf
    • http://engroupe.ca/aym_image/files/19377863198.pdf
    • http://www.iece.in/userfiles/file/24361275074.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/47376655017.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609662c383c22---41573531701.pdf
    • http://ahkjt.com/upfile/file/16149929961.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/coejd8gijapioo3o4pmmvh03u3/80717604363.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9601f8d005---jafujutinewosasupawekud.pdf
    • https://autosaloncenter.com/uploads/file/4929914683.pdf
    • http://ncabhsa.com/clients/875427/File/valijojurezabato.pdf
    • http://webbuilders.com/files/file/nulodebavunalezovatet.pdf
    • http://skolicka.eu/foto/images/file/ketevedelerokodexi.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/22567050345.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb53853cb---92351602901.pdf
    • https://dintek.eu/uploads/file/91515959045.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08342eb475---4023554641.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/kugemawolurerapupevuze.pdf
    • http://halmar.info/userfiles/file/90641872388.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd29fcab247---56101744314.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_off0000bc72.bin
89b1371e0f98cc7ebdbfc65be0e83f97abd12cc4f35ed1985ed6e7064170e0fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC72 16788 bytes
font_01_sfnt_off0000e870.bin
cf78aad44ccdf423f04dd670439892d331bbe30f18dfb7a083072b334d9a3139
pdf-font-stream PDF embedded font (sfnt) at offset 0xE870 10676 bytes
font_02_sfnt_off000100b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 16792 bytes