Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec29706d18c2af2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-08 08:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 839fb6d3748c5f4abfdf1ac1f5886944 SHA-1: de1128cb0a5a260252902777638f5bd223278bba SHA-256: 5ec29706d18c2af248c97f38daf1c2cb69c5298f3e613aa3f878c068165a3caf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting indicates a pattern of attempting to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=bohemian+rhapsody+piano+sheet+music+easy+pdf+free PDF link annotation
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cde8e61b4---fiboxowibiditujazirogumer.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/35590249053.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92e220c56e---77268523805.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/nivenu.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/27639682745.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/67213551489.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/191f67d26ad3a83542b6e7cf62469043/18170661954.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0208f8cc20---wateloloxuvivupujop.pdfIn PDF document text
    • http://novafish.it/userfiles/files/wopokoma.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/49245529738.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/36759872460.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/20dcc6cb12828797f72806f2208db49d/zebufubobedowinanetisi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/395c05ac37034ccb6b7beda387142be3/ralotepasebemoduluxo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nk0j7filtjfcludndh53s9jm9g/34000570512.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/236949c46fb5db19a6fe5b7ada3df0ea/94122733590.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/89274568333.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc07d3cc9---gefevejexopifupuram.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/satekepomujuvun.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e830bfd09a3---70604977054.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec29de2b19---93134403721.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/77777812504.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a3eeaab4---57004920345.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083e2a496a24---pemilixagevopav.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b3c9ccdc---roliz.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_off0000b63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63D 15004 bytes
SHA-256: 075e8b55ff224ca09c86da7dcf9f3fffe53957d2cf6c3aefa5b7a95d1bbe3988
font_01_sfnt_off0000db7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 11104 bytes
SHA-256: 5b7b7d7ae2a21f9592b55dc24ae7357a21d478ddf7830a57537ea1d2a6498123

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