Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c5cc0bf7316763…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 02:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9bfa1c2e529605c0c9c46f4d5b8ceb40 SHA-1: af27a15554e0a9b0e3fd8532686437f064f96aa0 SHA-256: 43c5cc0bf731676323b7e0248e4ac44a9a637b93aea23e8a2c1eebe84ff1236a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs further supports this, indicating the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://inwebjor.ru/uplcv?utm_term=oedipus+rex+pdf PDF link annotation
    • http://peneleos.pl/userfiles/file/8245459912.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080f50cd83d6---kosedo.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/14349800071.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/jinovenesanokusababobo.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/f212aj4di0ed5k36frrm6dhprd/fitowopolup.pdfIn PDF document text
    • https://hirurgija.me//files/53090641283.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f66bae433---56951099258.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/fawaxajumunajunelerup.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/67155714962.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c89c9d1b---4795997080.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/11414991050.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/l7s83k5j6kbrcad9i1kqvhvko5/mamiloniza.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/61366878146.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/jukulukupi.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zasomojibizozupade.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/95780886609.pdfIn PDF document text
    • https://atrax.hr/files/82170920188.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/topiwe.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/7nuad3sggn8rig94qdm3a3ukl5/rovekuked.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/2861246823.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/9jshbt99o1g42kamalq0ja98ih/tujilevolasefetonepa.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160954b109cc30---nupazunadu.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/pabajatipetosumejobepe.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/70553120535.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e24698705---21103998388.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/335d3964ca9e9f30ed9efddc480fde19/lijukewab.pdfIn PDF document text
    • 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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 10188 bytes
SHA-256: 12c0084d079ab2a0fa15b48831f6746da192b5b68978d0db93027cdd10e2648d
font_01_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 19660 bytes
SHA-256: 1902ee6be8f0ec7eb5965e570737ea72e6d83aa30d555f67abaa4002d0d7f821
font_02_sfnt_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1