Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce30652dc8b1e05…

MALICIOUS

PDF

98.6 KB Created: 2021-06-29 11:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 92645a11fa45f7ab21a5fb3fd5676678 SHA-1: 3d09e8bf13aed60984e548f98aa36ecb39d13650 SHA-256: 8ce30652dc8b1e05e972b1148c3e0d53d6891f986c119ab0ae1d3a756b10d63d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as malicious and a ML classifier with high confidence. It contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2210oib0rfhdvqdt9locauoeud/mufapizebuguduge.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/sopc2qdeh64p3273633rraa9j4/zawotagepiroro.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/50799726746.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/17395051807.pdfIn PDF document text
    • https://beliangka.com/contents//files/5938681028.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xedokibasagufafofedog.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c589142086a---vudulufiwewe.pdfIn PDF document text
    • https://stopserv.ru/files/file/40296862226.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607909596c7af---86807206361.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210611062807.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/d1atrbnh4m33k0591190mrtip1/nusomofopuluwimipane.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/016980eeaca767fc2bbdba066aeda27f/pepapetupalupiziporafim.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a42d6e150---38667450724.pdfIn PDF document text
    • https://rintrans.com/files/dakibo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecb2633b91---97320817134.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a6a73c3b---zeniginisefel.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/33628445486.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/faxikesikirevupaponuda.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/43607549901.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606d145e3ccae---32536021113.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/29d3a478878adf82bd8bdfe1bc61f5bb/wamigelumubefiburenal.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07ad852f1---7815251192.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab90235ca1a---lejijiveruwi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f354b820---pipekupukenokefe.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16071a203e9e0f---funaluzaleza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=raw+bean+sproutsPDF 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_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13692 10480 bytes
SHA-256: 14df84f845fbbc6fa907402cd629ceee101ef10b9a2ead24ee3a7b1184a8b91c
font_02_sfnt_off00014e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6E 18380 bytes
SHA-256: 9eddeb93c2d09f878aa5e74c6658176fc52faa6cf9eb656df36cb8efb04b1b65