Malicious PDF — malware analysis report

Static analysis result for SHA-256 4720fd48f2aec839…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 01:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a944864058165268895beb43ff7f6eea SHA-1: 4371e4597e45802db0ced67c027debb4e009e25a SHA-256: 4720fd48f2aec83912c3cde94ee193667d301c7e441b3fda797a46ea8681e7d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with multiple external URIs pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://smidgel.ru/uplcv?utm_term=offline+android+porn+games PDF link annotation
    • http://unitekinfostructures.com/userfiles/file/xolesozadofexujo.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1633040572.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/kezowovurenuwakexaxu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0f7239eba8ae8d192f367063091cc638/80696244044.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/tilexuzatoxejasazulux.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/xobupusuros.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/94412626012.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613db53fb4d48---buvodam.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/8953011996.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/91542351565.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/xigapetefalubototowategem.pdfIn PDF document text
    • http://agavietnam.com/img/files/74041520794.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/kozenarixedotiveju.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/95222333791.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/d53063c17f489bd42b05aa2a1f81149c/jojamimawilikikebax.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/delumeg.pdfIn PDF document text
    • http://tykhchem.com/upload/files/zikezojogonu.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_off0000abdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F2 10768 bytes
SHA-256: fb21d0ee3db1773f74d906c64dcdf9cc6009180f73f1ed1432e3ac05f62cabef
font_02_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 16488 bytes
SHA-256: 028a7cb75a4c0517b20d9ffcff1d5124915dee9dfa82f45646fdcf19b2c1af48

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