Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ea9f4a1317fe2a…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 03:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a54604edc50fb040d8548e876d6a1b18 SHA-1: 32252017ce827266608bb17fca54d31927091c12 SHA-256: d2ea9f4a1317fe2a1b5e5c37feb0d7e7ce999102ce804d86186cfd43e635abdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=apps+like+2ndline PDF link annotation
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rdasm2kg5lnoou2r9r2jgh1g3g/30041203371.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/vevim.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/98080091503.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/xokavefewomigiru.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/58159519973.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/57264402239.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141337d10ee0---dogigiresujedademu.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/29821437022.pdfIn PDF document text
    • http://unityproductions.com/upload/files/42260456969.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/42110742484.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/93301214829.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/detitidux.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/35497075578.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/fd8aoe4nh2rnimfu2v6drjml5i/pagilupe.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/rubukaduzode.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e2fecc1a0c25f4b4ffd7f37eb0445507/lovuzigobi.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/vumuraluwefutokepewasiv.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a8063231---reronirimidipolozojuwej.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/39335775139.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/39767004978.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7d38a915b833c8b8856170e5bf997c73/dexixoxuvifetodoxumojavo.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/39057411787.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/24946983662.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_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 17596 bytes
SHA-256: 267129d00dbf477b5790971a7bcbc9f9c566b64e5faf3cf8dcfbe188f84306a2
font_01_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 10100 bytes
SHA-256: 841b8f398080fe4d247152a7843b994649bec139f3045b7a1a62c4133616b6f0
font_02_sfnt_off00012441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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