Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51730395705f06a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 13:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ed8a00d2df862b85dd46c2a6a5b116d SHA-1: a6dc08db917e1fac808dc1e28d181a27f62c575d SHA-256: c51730395705f06a3702e2c6ee6c59b9d6919da98a74fc245aedeb0280febbe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised CMS upload directories, suggesting it's used to distribute further payloads or phishing content. The presence of numerous unknown URLs associated with compromised WordPress sites supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b8cf0dced---45033885956.pdf In PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c7a017fe6caff6fd8eb5dce7b8eb83e0/17881316625.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a1b8fed08688512968015a6b9fc6e79f/18124285218.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/22e2adb9a61260bec62fd2b3b0e7516a/68870351399.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c14f7ad37d4---nazawomuzaromifokov.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/81060434285.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/29567592700.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/86697064994.pdfIn PDF document text
    • https://mavibusiness.it/file/56698467300.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/34311444926.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b6ff794f0bd1370398a48342fdd2ee2b/77177763157.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/ripigejixafezadidoteze.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/41225135261.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/72317f027a6f70ec4e8e486d12ada23f/melolekopasar.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a9b69383da3348342f99f77587568692/fuxujutimisowi.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/bozozemo.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/sidurikopepigefe.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1eb4a0831---84915231182.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/9uknof0uaqiql7aehh61mf1521/58236923632.pdfIn PDF document text
    • https://tavio.ru/files/file/rutupekajelowolubuj.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/564d4cfd4793891590047977c8e2e3e6/10876322514.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/56079637358.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/55831565218.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/1622904134.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/20829057971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=boldly+i+approach+chords+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_off0000d11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 17388 bytes
SHA-256: b17852bdbfa42d79b68e371b1b3ffb6cd172d1d5c67e5d2f3fdd120321ed5b55
font_01_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 10548 bytes
SHA-256: 5e6ec093791ea5f73b593d42b25f920b87ca135cf243c0856fff2911f803165b
font_02_sfnt_off00011615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.