Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef1b2ca4968a255…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 23:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 422d5f246b14fb24d60a1111f2069900 SHA-1: 3de5f0dae38fd064b589b7e96620c23c5acd8f54 SHA-256: 2ef1b2ca4968a255e58edbc569a7b1eed307236d98de8c0fe9cbaa50556328b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9a511781---5996804714.pdf In PDF document text
    • http://norrlandet.se/userfiles/file/fewipero.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/99123324128.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/nibupakaw.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/dikamebarufurepunexamuv.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20218894116357.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c02db317ae6---29485466630.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846c23b27a4---73722092649.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/10b5ec3586ce1a5eec4652fd3135d3d3/44826401824.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8e43346020c39b1873d50f0c964f3acd/zalanedusisefavijafi.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/sokojenaw.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/541e8fcbbd9a56cb4cc290644ed17620/davur.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d25d04f4e---bugan.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/46405252343.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/negixe.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cffcbc41f0---55399222887.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a0023c3160095d31f2dfae770033edc7/laranubere.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ecbcf2364b3c6b49d9d4e0cac1464393/36984691368.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/90497899593.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/69430665228.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609201892f897---bedofikase.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/55831173517.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/98748524299.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/96829304637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=preamble+to+the+declaration+of+independence+worksheetPDF 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_off0000d175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 17528 bytes
SHA-256: 26dde4942459fbb178c07f30e86ced6ca1eeaf11bcdb114a59ad24b96d5839ee
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 11204 bytes
SHA-256: e7c56bfa2014a81dece5d92abd00a8e60d82181e637a4fb4a460e44615f0370e