Malicious PDF — malware analysis report

Static analysis result for SHA-256 1702442104eb9aad…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 02:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63b0ba3e72c88db4de651e636e34807a SHA-1: d8435cee37cca97a1618a059af00838364c5c141 SHA-256: 1702442104eb9aad7738662e075e591ef62f2cbaa17d24cb3916cab16e74baaa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to lure victims. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=hundreds+chart+worksheets+1st+grade PDF link annotation
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/sud0hjpplegba34m6i6i4cgn84/46166330669.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/katas.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719bd43d7ec---nukilidipifelinogajigepa.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c79cc0b77b2---70272910780.pdfPDF link annotation
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/74691714347.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/11619060161.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d663a61adfe---nomuto.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/18735734354.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/tekokaxovavowigetumagi.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/18824407366.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f2104ef4---91134014542.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/gololabileperoki.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/minonewetokunata.pdfIn PDF document text
    • https://777mto.com/contents//files/fonapodifosunagi.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/varemoxikesozepafozufe.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/lexegi.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/65333495162.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/weniseku.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/59064742743.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/000mqgf85lnsdsb8a1u668m2l4/45867614219.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/7g93h3d3442osa8h3q16u16n8c/kesaximevudopivalelugifa.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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 10832 bytes
SHA-256: 298ec0e53b1dd75083934aad57a91b3009b7bbc0bc6fefab4602c46f56d69aa7
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 17092 bytes
SHA-256: ce8af502a5ac273b2e71a5ffc4a579a5a490469e5deb537317cb69c7b2f7077a
font_02_sfnt_off0001187a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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