Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba51a7e174fd08ac…

MALICIOUS

PDF

74.1 KB Created: 2021-06-05 11:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8175e5c5ce893a4260430f384fc22913 SHA-1: b323963b1b701ca930c1a316434e68fc6c1fce36 SHA-256: ba51a7e174fd08ac5f01356ee04ef68d270394b006746d543e1bb80bdc07999b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=libro+el+poder+de+la+kabbalah+de+yehuda+berg+pdf PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uvkcsks0p5o1jl223nrondg0c2/21139788759.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa66641c2---4031857858.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607526ed532d0---wegitatamorizizeruxak.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/113240c06966581d8db85c6fd65cc34a/83015185923.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448377e807---gerifofolovo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/bktla2dtfvi78qmbfdj58umu5m/ganugubupegut.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f659fe0fb5---35526160069.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160703b227aaf9---58839797005.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f462e5dd1285caf174e2051045137929/47043916905.pdfIn PDF document text
    • http://allycatering.com/userfiles/30784417601.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/91776419532.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/80546009700.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/57414d3c41d1ce886a2784e0d53327e8/88205307278.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9186d8372---muxobowowoxajofizoxisuwo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/p5sm0spkmt8l4tq80mtpjvivnd/15424854751.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1d3b59a1---sibofokorupesabixuzuzij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000cbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDB 5372 bytes
SHA-256: 4936c56f7a1b534dc3f8b649fc5d2ffdf8b3c1408d34c0fc4bf0a4b86202fd9a
font_01_sfnt_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 11632 bytes
SHA-256: 59458474d011a688c76451f7e7f6dbc8dca0aa7a83e239f37e1b9b9c502e0df2
font_02_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61