Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f0c6d858a762c9…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 15:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9c6bd9d8a0fdb5580ce904e0c0f49f4 SHA-1: 1404e0f3f855fde0c3de79a736d87f2163ce2ab5 SHA-256: 87f0c6d858a762c9bb50b89a2e79915cda0c973216c75ac144ec61b6e52d53b5
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 are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or directing users to phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://huntic.ru/uplcv?utm_term=psychrometric+chart+pdf+carrier PDF link annotation
    • http://jcbcharpentebois.com/ressource/site-image/files/97193393067.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc8ccc8f8d---32969370106.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/29566400618.pdfIn PDF document text
    • http://rts-3.ru/upload/files/zovuteminebezur.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/fewijirexudo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e559a8757---88297899609.pdfIn PDF document text
    • https://attack.lt/images/files/87648412032.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/38712040342.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608601b419a47---88958792009.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/derugilapowulexi.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/67423566543.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/68lo5rf6sfa6unggms9rpfmdqg/balamiduko.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/zejixanof.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3a022cbd---73141058935.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rpr35l2t941cpccoc4mociijn4/22736398711.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/89953694984.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/38ae0e247dbb190ce400896b20eb7ddc/tabis.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fe67bda9d---domugubawuzukad.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/benutopa.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/femipofin.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jimodirofalerero.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb027db173---37668614371.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_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10848 bytes
SHA-256: 95e1eef1ebc391128e459944b9091307b9e9622d587fe7d57ae470d560e62aaf
font_01_sfnt_off00010b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B59 18188 bytes
SHA-256: 8193e0ef4d175446e76ed22bc696fc2a148c9eba5f7d5b397c39937ce09d28a2
font_02_sfnt_off00013a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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