Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be5cadc9faa85d7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 12:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78a1fa69209b2acf3a4e4dcc08120991 SHA-1: 411e95622f3eaa247f8734dff4fc31fc6f9195c2 SHA-256: 3be5cadc9faa85d7f4fb6515da72db27668c67f4efc2935a03994f645edc50f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute further malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://aceonlinementors.com/userfiles/file/telezaliroxadimijuj.pdf In PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161013315af142---geruwexof.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/rikubuniwepikazilalusaxiz.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/wolezobaxowonabomad.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/mirapesisud.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0c6a0caf8---82642976437.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/80074304684.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/79246381487.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f06117f04---jumepok.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a6cf7ac25fe675860e1dfbc2b0345c3b/58711007731.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/86745013365.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/keziwaginuguzoferit.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/figodutidol.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b2178krd3g92v3me3728odulc5/sokigigidorojojip.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/806ef4655b056c9da47f5741dca21713/sujobumogudedoratosanove.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dimadugutamikawogu.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/32629432317.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/12887679410.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c831b68a1e0f98e77dfaeb30f1dd84de/74032737097.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/fb7e49a6c46f2dfbb10ef3a60a52d342/zufevodidodu.pdfIn PDF document text
    • http://technocom.pl/editor/file/zemivaxejuzuzefeliroxon.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161337fad5fefa---50778501293.pdfIn PDF document text
    • https://tepihtrava.rs//files/60740580571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=modicare+products+dp+price+list+pdfPDF 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_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 17352 bytes
SHA-256: fe4b7275276b09fb563612dbf6b1cf6e6f9d5c14fe9914980b78989c76374360
font_01_sfnt_off000100eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 10604 bytes
SHA-256: 83e2bc232438089467e30566071a00d31457c81e0eb46d67169ed298ed17b17c