Malicious PDF — malware analysis report

Static analysis result for SHA-256 d410a593034ef190…

MALICIOUS

PDF

98.3 KB Created: 2021-09-07 10:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44d9ca9eb9f785d1c03a18ea89011af0 SHA-1: 0b4663b202b5a4b78ae72753ce195ebdaac43108 SHA-256: d410a593034ef1901206c0e0fa16950a3d85896219b324734234298cc36e15bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable or compromised hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095db1a2c598---5415539605.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/11a561e7d52a44418ccedc637a859470/4540349577.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/fumuzexixezidaxemovoj.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2jve1nq7nirrc2p27u4ssl9ort/56638696435.pdfIn PDF document text
    • http://france-ex.com/73287335693.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/turirufuxum.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/99199116031.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/14055718517.pdfIn PDF document text
    • http://strandedtattoo.com/file/fefiwupoxavebarumado.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/17a17c4e50a761e5e6dc846a4dd77931/23956039777.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/72422512873.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/10282908037.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160794101a18d2---lavozipajutibisej.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/ganawuguko.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f831e707---sekuxejizazari.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/makoxufefemekanux.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/vm33hgk41q5kc79bff47ut0sff/zagojirovaririlojiso.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8d7c42174---18882671075.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/46557362527.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/50640013020.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/6467545548.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab5063f2a---67984347137.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce94fbc5eb---22959633671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=composite+functions+and+their+domains+worksheetPDF 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_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 19120 bytes
SHA-256: 3a8a5b9d75300707bb9ff4df5e6af836c9a9d7769dae41d81ae2168b8dc55471
font_01_sfnt_off0001492f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16146 11148 bytes
SHA-256: 6c906c2fde599cd5f172436ad90c7e4068a94d8c380f05c3bc3afb4a05872451

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